EVGA

Helpful ReplyHot!What is the order of power draw across the 3x power connectors?

Page: 12 > Showing page 1 of 2
Author
Coldblackice
New Member
  • Total Posts : 55
  • Reward points : 0
  • Joined: 2010/08/08 03:48:29
  • Status: offline
  • Ribbons : 0
2020/10/28 22:32:07 (permalink)
How does the "ordering" of power draw work across the 3x power ports (+ PCIe slot)? For example, if a 3080 suddenly needed 450W of power, how or in what order would that be drawn from? Would it grab up as much power as it can get from one source before moving onto the next, e.g. 75W from PCIe slot (..75W) -> 150W from 8-pin #1 (..225W) -> 8-pin #2 (..375W) -> 75W from 8-pin #3 since that's all that's needed to reach 450W?
 
If there was a scenario where you had two 8-pin PCIe power cables + one 6-pin cable, and given 6-pin cables will only have 75W max drawn over them, what would happen in this case? Would it matter which power port the 6-pin was plugged into? Is power drawn through the ports in series or parallel? How would the GPU respond in a case like this (2x 8pins + 1x 6pin)?
#1
jankerson
SSC Member
  • Total Posts : 710
  • Reward points : 0
  • Joined: 2017/07/13 06:50:53
  • Status: online
  • Ribbons : 1
Re: What is the order of power draw across the 3x power connectors? 2020/10/28 22:40:53 (permalink)
When the GPU is just idling it uses one 8 Pin.
 
However once the GPU is actually being used in a game as an example all 3 connections are used.
 
The last two kick in at the same time.
 
I know this because I can see what is happening and how it works with my PSU.
 
I have Realtime monitoring by rail (12 Rails) on my PSU. 
 
 
That said:
 
if you have a PSU that doesn't have the proper connections then one needs to buy a new PSU.
 
If it doesn't have 3x 8 Pin connectors it's either low quality and or too old and needs to be replaced.
post edited by jankerson - 2020/10/28 22:47:52

i9 9900K @ 5.0 GHz, NH D15, 32 GB GSKILL Trident Z RGB, AORUS Z390 MASTER, EVGA RTX 3080 FTW3 Ultra, Samsung 970 EVO Plus 500GB, Samsung 860 EVO 1TB, Samsung 860 EVO 500GB, ASUS ROG Swift PG279Q, Steel Series APEX PRO, Logitech Gaming Pro Mouse, CM Master Case 5, Corsair AXI 1600W.
 
i7 8086K, AORUS Z370 Gaming 5, 16GB GSKILL RJV 3200, EVGA 2080TI FTW3 Ultra, Samsung 970 EVO 250GB, (2)SAMSUNG 860 EVO 500 GB, Acer Predator XB1 XB271HU, Corsair HXI 850W.
 
i7 8700K, AORUS Z370 Ultra Gaming, 16GB 16GB DDR4 3000, EVGA 1080Ti FTW3 Ultra, Samsung 960 EVO 250GB, Corsair HX 850W.
#2
Bruno747
CLASSIFIED Member
  • Total Posts : 3778
  • Reward points : 0
  • Joined: 2010/01/13 11:00:12
  • Location: Looking on google to see what Nvidia is going to o
  • Status: offline
  • Ribbons : 4
Re: What is the order of power draw across the 3x power connectors? 2020/10/28 22:51:08 (permalink)
Ultimately the answer would need to come from EVGA. However, from what I see on gamer nexus' tear down, it looks like the three connectors each have their own fuse and then maybe become a common connection? In that case draw would be pretty much even from how ever many are plugged in. External factors aside like whether the PSU is single rail vs multi rail etc.
 
Edit: Person above me responded while I was typing. Interesting that it appears to use 1 then kick over the other 2 as needed.

X399 Designare EX, Threadripper 1950x, Dual 960 EVO 500gb Raid 0 bootable, Quad Channel 64gb DDR4 @ 2933/15-16-16-31, SLI 1070 G1 Gaming, Corsair RM850x, Tower 900
#3
CraptacularOne
Omnipotent Enthusiast
  • Total Posts : 13140
  • Reward points : 0
  • Joined: 2006/06/12 17:20:44
  • Location: Florida
  • Status: online
  • Ribbons : 181
Re: What is the order of power draw across the 3x power connectors? 2020/10/28 23:10:08 (permalink) ☄ Helpfulby Coldblackice 2020/10/29 02:58:42
jankerson
When the GPU is just idling it uses one 8 Pin.
 
However once the GPU is actually being used in a game as an example all 3 connections are used.
 
The last two kick in at the same time.
 
I know this because I can see what is happening and how it works with my PSU.
 
I have Realtime monitoring by rail (12 Rails) on my PSU. 
 
 
That said:
 
if you have a PSU that doesn't have the proper connections then one needs to buy a new PSU.
 
If it doesn't have 3x 8 Pin connectors it's either low quality and or too old and needs to be replaced.


That's not how it works at all and no, your PSU doesn't have 12 rails. Furthermore no, if a PSU doesn't have 3 8pin connectors doesn't mean it's too old or poor quality. Please stop posting nonsense and stating it as fact when you have no idea what you're talking about. 
 
For starters your PSU has a single large 12v rail
https://www.kitguru.net/components/power-supplies/zardon/corsair-ax1600i-digital-power-supply-review/3/
 
Secondly no, it will not start at one of the 8 pin connectors and activate the other 2 later. The card will in fact be drawing power from all available power inputs simultaneously at any given state be it idle or load. It will balance that load between all available power inputs to their allowances but often will not pull more than 75w from the PCI-E slot as a fail safe so you don't risk melting your 24pin ATX connector or damaging the motherboard that isn't designed to feed large amounts of power though the PCI-E slot. 
 
post edited by CraptacularOne - 2020/10/28 23:13:19

i9 10850K @5Ghz H2O.........................Ryzen 7 5800X @4.7Ghz
PNY XLR8 RTX 3090 H2O......................EVGA RTX 3070 XC3 Ultra
Viotek SUW49C 32:9 Ultra Wide............Oculus Rift S
Gigabyte Z490 Aorus Elite AC................ASUS TUF Gaming X570 WiFi
32GB Dominator Platinum 4000Mhz.......32GB OLOy Warhawk 3600Mhz
EVGA G3 SuperNova 1000w..................EVGA G3 SuperNova 750w
#4
Hoggle
EVGA Forum Moderator
  • Total Posts : 6506
  • Reward points : 0
  • Joined: 2003/10/13 22:10:45
  • Location: Eugene, OR
  • Status: online
  • Ribbons : 4
Re: What is the order of power draw across the 3x power connectors? 2020/10/28 23:11:37 (permalink)
I would say that it really shouldn't be a problem to have three 8 pins connected. If it is I would trade out the power supply since it's not worth saving money on a cheap GPU when you are hooking it up to expensive hardware.

Use an Associates Code & SAVE 5% - 10% on your purchase. Just click on the associates banner to save, or enter the associates code at checkout on your next purchase. If you choose to use my code I want to personally say "Thank You" for using it. 
 
 
#5
jankerson
SSC Member
  • Total Posts : 710
  • Reward points : 0
  • Joined: 2017/07/13 06:50:53
  • Status: online
  • Ribbons : 1
Re: What is the order of power draw across the 3x power connectors? 2020/10/28 23:20:47 (permalink)
CraptacularOne
jankerson
When the GPU is just idling it uses one 8 Pin.
 
However once the GPU is actually being used in a game as an example all 3 connections are used.
 
The last two kick in at the same time.
 
I know this because I can see what is happening and how it works with my PSU.
 
I have Realtime monitoring by rail (12 Rails) on my PSU. 
 
 
That said:
 
if you have a PSU that doesn't have the proper connections then one needs to buy a new PSU.
 
If it doesn't have 3x 8 Pin connectors it's either low quality and or too old and needs to be replaced.


That's not how it works at all and no, your PSU doesn't have 12 rails. Furthermore no, if a PSU doesn't have 3 8pin connectors doesn't mean it's too old or poor quality. Please stop posting nonsense and stating it as fact when you have no idea what you're talking about. 
 
For starters your PSU has a single large 12v rail
https://www.kitguru.net/components/power-supplies/zardon/corsair-ax1600i-digital-power-supply-review/3/
 
Secondly no, it will not start at one of the 8 pin connectors and activate the other 2 later. The card will in fact be drawing power from all available power inputs simultaneously at any given state be it idle or load. It will balance that load between all available power inputs to their allowances but often will not pull more than 75w from the PCI-E slot as a fail safe so you don't risk melting your 24pin ATX connector or damaging the motherboard that isn't designed to feed large amounts of power though the PCI-E slot. 
 




 
Yes, I know what my PSU is and how modern Multi-Rails are set up.
 
One rail with Multi-Rail OCP, mine is per 12V+ connection or 12 Rail OCP with my PSU. Adjustable up to 40A per connection.
 
That said:
 
I can actually see them kick in since each connection is monitored separately in real time.
 
I can see the power draw on one connection while idle, then the other two once the GPU kicks in.
 
GPU is connected to #8, #9 and #10 on my PSU. All show Zero when Idle.
 
Lastly:
 
Yes, if the PSU still has 6 Pin PCIe connections then it is either too old or low quality.
 
Modern high quality PSUs have 8 pin PCIe connections, either in 6+2 or 8 Pin depending on the actual cables.
 
 
 
 
post edited by jankerson - 2020/10/29 01:23:13

i9 9900K @ 5.0 GHz, NH D15, 32 GB GSKILL Trident Z RGB, AORUS Z390 MASTER, EVGA RTX 3080 FTW3 Ultra, Samsung 970 EVO Plus 500GB, Samsung 860 EVO 1TB, Samsung 860 EVO 500GB, ASUS ROG Swift PG279Q, Steel Series APEX PRO, Logitech Gaming Pro Mouse, CM Master Case 5, Corsair AXI 1600W.
 
i7 8086K, AORUS Z370 Gaming 5, 16GB GSKILL RJV 3200, EVGA 2080TI FTW3 Ultra, Samsung 970 EVO 250GB, (2)SAMSUNG 860 EVO 500 GB, Acer Predator XB1 XB271HU, Corsair HXI 850W.
 
i7 8700K, AORUS Z370 Ultra Gaming, 16GB 16GB DDR4 3000, EVGA 1080Ti FTW3 Ultra, Samsung 960 EVO 250GB, Corsair HX 850W.
#6
CraptacularOne
Omnipotent Enthusiast
  • Total Posts : 13140
  • Reward points : 0
  • Joined: 2006/06/12 17:20:44
  • Location: Florida
  • Status: online
  • Ribbons : 181
Re: What is the order of power draw across the 3x power connectors? 2020/10/29 00:01:12 (permalink)
@ jankerson
You quite literally have no idea what you're talking about or what you're looking at and should refrain from giving PSU advice and how electrical current draw works. For starters open GPUZ and go to the sensor tab and you can see at any given time when your card is drawing from where. I guarantee you that 2 of your 3 8pin connectors will not be reading "0' at any point. If your PSU stopped supplying power to any of the connectors at any given time the card would shut down and give you an error message telling you to  plug in the PCI-E power connectors. Don't believe me? Feel free to unplug your card at idle while at the desktop and tell us what happens. 
 

i9 10850K @5Ghz H2O.........................Ryzen 7 5800X @4.7Ghz
PNY XLR8 RTX 3090 H2O......................EVGA RTX 3070 XC3 Ultra
Viotek SUW49C 32:9 Ultra Wide............Oculus Rift S
Gigabyte Z490 Aorus Elite AC................ASUS TUF Gaming X570 WiFi
32GB Dominator Platinum 4000Mhz.......32GB OLOy Warhawk 3600Mhz
EVGA G3 SuperNova 1000w..................EVGA G3 SuperNova 750w
#7
jankerson
SSC Member
  • Total Posts : 710
  • Reward points : 0
  • Joined: 2017/07/13 06:50:53
  • Status: online
  • Ribbons : 1
Re: What is the order of power draw across the 3x power connectors? 2020/10/29 00:04:08 (permalink)
CraptacularOne
@ jankerson
You quite literally have no idea what you're talking about or what you're looking at and should refrain from giving PSU advice and how electrical current draw works. For starters open GPUZ and go to the sensor tab and you can see at any given time when your card is drawing from where. I guarantee you that 2 of your 3 8pin connectors will not be reading "0' at any point. If your PSU stopped supplying power to any of the connectors at any given time the card would shut down and give you an error message telling you to  plug in the PCI-E power connectors. Don't believe me? Feel free to unplug your card at idle while at the desktop and tell us what happens. 
 




 
I am not looking at GPUz....
 
I am looking at my PSU software in Corsair Link.
 
My PSU is a hardware link directly to the MB by a USB cable.
 
That's real time monitoring and control for the PSU.
 
 
post edited by jankerson - 2020/10/29 00:06:12

i9 9900K @ 5.0 GHz, NH D15, 32 GB GSKILL Trident Z RGB, AORUS Z390 MASTER, EVGA RTX 3080 FTW3 Ultra, Samsung 970 EVO Plus 500GB, Samsung 860 EVO 1TB, Samsung 860 EVO 500GB, ASUS ROG Swift PG279Q, Steel Series APEX PRO, Logitech Gaming Pro Mouse, CM Master Case 5, Corsair AXI 1600W.
 
i7 8086K, AORUS Z370 Gaming 5, 16GB GSKILL RJV 3200, EVGA 2080TI FTW3 Ultra, Samsung 970 EVO 250GB, (2)SAMSUNG 860 EVO 500 GB, Acer Predator XB1 XB271HU, Corsair HXI 850W.
 
i7 8700K, AORUS Z370 Ultra Gaming, 16GB 16GB DDR4 3000, EVGA 1080Ti FTW3 Ultra, Samsung 960 EVO 250GB, Corsair HX 850W.
#8
CraptacularOne
Omnipotent Enthusiast
  • Total Posts : 13140
  • Reward points : 0
  • Joined: 2006/06/12 17:20:44
  • Location: Florida
  • Status: online
  • Ribbons : 181
Re: What is the order of power draw across the 3x power connectors? 2020/10/29 00:09:05 (permalink)
jankerson
CraptacularOne
@ jankerson
You quite literally have no idea what you're talking about or what you're looking at and should refrain from giving PSU advice and how electrical current draw works. For starters open GPUZ and go to the sensor tab and you can see at any given time when your card is drawing from where. I guarantee you that 2 of your 3 8pin connectors will not be reading "0' at any point. If your PSU stopped supplying power to any of the connectors at any given time the card would shut down and give you an error message telling you to  plug in the PCI-E power connectors. Don't believe me? Feel free to unplug your card at idle while at the desktop and tell us what happens. 
 




 
I am not looking at GPUz....
 
I am looking at my PSU software in Corsair Link.
 
My PSU is a hardware link directly to the MB by a USB cable.
 
That's real time monitoring and control for the PSU.
 
 


Lol please just stop. Open GPUZ all the info you need about what’s ACTUALLY happening is there for you. Your card doesn’t work any differently than any of ours and your PSU isn’t magic. For your own good, open the tool and see what it’s telling you. 

i9 10850K @5Ghz H2O.........................Ryzen 7 5800X @4.7Ghz
PNY XLR8 RTX 3090 H2O......................EVGA RTX 3070 XC3 Ultra
Viotek SUW49C 32:9 Ultra Wide............Oculus Rift S
Gigabyte Z490 Aorus Elite AC................ASUS TUF Gaming X570 WiFi
32GB Dominator Platinum 4000Mhz.......32GB OLOy Warhawk 3600Mhz
EVGA G3 SuperNova 1000w..................EVGA G3 SuperNova 750w
#9
jankerson
SSC Member
  • Total Posts : 710
  • Reward points : 0
  • Joined: 2017/07/13 06:50:53
  • Status: online
  • Ribbons : 1
Re: What is the order of power draw across the 3x power connectors? 2020/10/29 00:15:08 (permalink)
CraptacularOne
jankerson
CraptacularOne
@ jankerson
You quite literally have no idea what you're talking about or what you're looking at and should refrain from giving PSU advice and how electrical current draw works. For starters open GPUZ and go to the sensor tab and you can see at any given time when your card is drawing from where. I guarantee you that 2 of your 3 8pin connectors will not be reading "0' at any point. If your PSU stopped supplying power to any of the connectors at any given time the card would shut down and give you an error message telling you to  plug in the PCI-E power connectors. Don't believe me? Feel free to unplug your card at idle while at the desktop and tell us what happens. 
 




 
I am not looking at GPUz....
 
I am looking at my PSU software in Corsair Link.
 
My PSU is a hardware link directly to the MB by a USB cable.
 
That's real time monitoring and control for the PSU.
 
 


Lol please just stop. Open GPUZ all the info you need about what’s ACTUALLY happening is there for you. Your card doesn’t work any differently than any of ours and your PSU isn’t magic. For your own good, open the tool and see what it’s telling you. 




 
GPUZ is software, not really accurate.
 
Direct connection/communication with the PSU is a hardware link that is accurate.
 
Almost as accurate as the Professional testing equipment if you do the research. 
 
It gives the information per connection in Amps, not watts or volts.
 
So for it to actually show more than zero the draw needs to be 12W or more.
 
Normally on #8, #9 and #10 when idle it shows 0, less than 12W. Amps X 12 = W.
 
 
 
Use the GPU and all 3 connections show more than Zero AMPS (+12W) because the card is drawing power because the GPU is active and needs the power.
 
It's not magic, it's technology. 
 
 
Here it is NOW at idle, Connection #8 #9 and #10 show zero or less than 12W.
 
#6 and #7 are the CPU. Yes, the MB actually uses both 8 pin EPS power connections, but that's another topic.
 
 

 
 
Here is the GPU loaded, active in FURMARK, you can see #8, #9 and #10 are loaded and actually pulling from the 24 Pin (PCIE slot). That's 39A or 468W from the 3x 8 pin and 5A or 60W from PCIe slot/MB for a total of 528W. Add in the CPU draw for a total of 612W just running Furmark. And that's what the PSU is supplying to the system, not from the wall.
 

 
 
post edited by jankerson - 2020/10/29 01:59:30

i9 9900K @ 5.0 GHz, NH D15, 32 GB GSKILL Trident Z RGB, AORUS Z390 MASTER, EVGA RTX 3080 FTW3 Ultra, Samsung 970 EVO Plus 500GB, Samsung 860 EVO 1TB, Samsung 860 EVO 500GB, ASUS ROG Swift PG279Q, Steel Series APEX PRO, Logitech Gaming Pro Mouse, CM Master Case 5, Corsair AXI 1600W.
 
i7 8086K, AORUS Z370 Gaming 5, 16GB GSKILL RJV 3200, EVGA 2080TI FTW3 Ultra, Samsung 970 EVO 250GB, (2)SAMSUNG 860 EVO 500 GB, Acer Predator XB1 XB271HU, Corsair HXI 850W.
 
i7 8700K, AORUS Z370 Ultra Gaming, 16GB 16GB DDR4 3000, EVGA 1080Ti FTW3 Ultra, Samsung 960 EVO 250GB, Corsair HX 850W.
#10
Coldblackice
New Member
  • Total Posts : 55
  • Reward points : 0
  • Joined: 2010/08/08 03:48:29
  • Status: offline
  • Ribbons : 0
Re: What is the order of power draw across the 3x power connectors? 2020/10/29 03:09:54 (permalink)
jankerson
When the GPU is just idling it uses one 8 Pin.
 
However once the GPU is actually being used in a game as an example all 3 connections are used.
 
The last two kick in at the same time.
 
I know this because I can see what is happening and how it works with my PSU.
 
I have Realtime monitoring by rail (12 Rails) on my PSU. 
 
 
That said:
 
if you have a PSU that doesn't have the proper connections then one needs to buy a new PSU.
 
If it doesn't have 3x 8 Pin connectors it's either low quality and or too old and needs to be replaced.



The reason I ask isn't because my PSU (Corsair RMx850) doesn't have the connections available, it's a question if I only had 2x 8-pin cables + 1x 6-pin cable available, wondering how the GPU would respond. I realize I could short the two extra pins (sense + ground) on the GPU together so the card knows it can draw the full 150W over the 6-pins (all three 12v pins + grounds being connected), but instead of doing that I'm wondering if the card would be able to "adapt" with two full 8-pins and a 75W 6-pin, making it unnecessary to buy + wait for a new 8-pin cable.
 
CraptacularOne
 
That's not how it works at all and no, your PSU doesn't have 12 rails. Furthermore no, if a PSU doesn't have 3 8pin connectors doesn't mean it's too old or poor quality. Please stop posting nonsense and stating it as fact when you have no idea what you're talking about. 
 
For starters your PSU has a single large 12v rail
https://www.kitguru.net/components/power-supplies/zardon/corsair-ax1600i-digital-power-supply-review/3/
 
Secondly no, it will not start at one of the 8 pin connectors and activate the other 2 later. The card will in fact be drawing power from all available power inputs simultaneously at any given state be it idle or load. It will balance that load between all available power inputs to their allowances but often will not pull more than 75w from the PCI-E slot as a fail safe so you don't risk melting your 24pin ATX connector or damaging the motherboard that isn't designed to feed large amounts of power though the PCI-E slot. 
 

How would the card react if two 8-pin cables + one 6-pin were connected? Would it be able to adapt by balancing the necessary wattage across the three ports? Would the card react any differently depending on which port a 6-pin cable was connected to?
#11
Coldblackice
New Member
  • Total Posts : 55
  • Reward points : 0
  • Joined: 2010/08/08 03:48:29
  • Status: offline
  • Ribbons : 0
Re: What is the order of power draw across the 3x power connectors? 2020/10/29 03:14:28 (permalink)
jankerson
 
GPUZ is software, not really accurate.
 
Direct connection/communication with the PSU is a hardware link that is accurate.
 
Almost as accurate as the Professional testing equipment if you do the research. 
 
It gives the information per connection in Amps, not watts or volts.
 
So for it to actually show more than zero the draw needs to be 12W or more.
 
Normally on #8, #9 and #10 when idle it shows 0, less than 12W. Amps X 12 = W.
  
Use the GPU and all 3 connections show more than Zero AMPS (+12W) because the card is drawing power because the GPU is active and needs the power.
 
It's not magic, it's technology. 
 
 
Here it is NOW at idle, Connection #8 #9 and #10 show zero or less than 12W. #6 and #7 are the CPU. Yes, the MB actually uses both 8 pin EPS power connections, but that's another topic.
 ...
Here is the GPU loaded, active in FURMARK, you can see #8, #9 and #10 are loaded and actually pulling from the 24 Pin (PCIE slot). That's 39A or 468W from the 3x 8 pin and 5A or 60W from PCIe slot/MB for a total of 528W. Add in the CPU draw for a total of 612W just running Furmark. And that's what the PSU is supplying to the system, not from the wall.
 

Are you able to test what the power draws are if 2x 8-pins are connected and 1x 6-pin? And if possible, if there's any difference when the 6-pin is connected to each respective port?
 
This is more so for theoretical curiosity than a mere solution to cable situation on hand.
#12
CraptacularOne
Omnipotent Enthusiast
  • Total Posts : 13140
  • Reward points : 0
  • Joined: 2006/06/12 17:20:44
  • Location: Florida
  • Status: online
  • Ribbons : 181
Re: What is the order of power draw across the 3x power connectors? 2020/10/29 03:37:31 (permalink)
Coldblackice
jankerson
When the GPU is just idling it uses one 8 Pin.
 
However once the GPU is actually being used in a game as an example all 3 connections are used.
 
The last two kick in at the same time.
 
I know this because I can see what is happening and how it works with my PSU.
 
I have Realtime monitoring by rail (12 Rails) on my PSU. 
 
 
That said:
 
if you have a PSU that doesn't have the proper connections then one needs to buy a new PSU.
 
If it doesn't have 3x 8 Pin connectors it's either low quality and or too old and needs to be replaced.



The reason I ask isn't because my PSU (Corsair RMx850) doesn't have the connections available, it's a question if I only had 2x 8-pin cables + 1x 6-pin cable available, wondering how the GPU would respond. I realize I could short the two extra pins (sense + ground) on the GPU together so the card knows it can draw the full 150W over the 6-pins (all three 12v pins + grounds being connected), but instead of doing that I'm wondering if the card would be able to "adapt" with two full 8-pins and a 75W 6-pin, making it unnecessary to buy + wait for a new 8-pin cable.
 
CraptacularOne
 
That's not how it works at all and no, your PSU doesn't have 12 rails. Furthermore no, if a PSU doesn't have 3 8pin connectors doesn't mean it's too old or poor quality. Please stop posting nonsense and stating it as fact when you have no idea what you're talking about. 
 
For starters your PSU has a single large 12v rail
https://www.kitguru.net/components/power-supplies/zardon/corsair-ax1600i-digital-power-supply-review/3/
 
Secondly no, it will not start at one of the 8 pin connectors and activate the other 2 later. The card will in fact be drawing power from all available power inputs simultaneously at any given state be it idle or load. It will balance that load between all available power inputs to their allowances but often will not pull more than 75w from the PCI-E slot as a fail safe so you don't risk melting your 24pin ATX connector or damaging the motherboard that isn't designed to feed large amounts of power though the PCI-E slot. 
 

How would the card react if two 8-pin cables + one 6-pin were connected? Would it be able to adapt by balancing the necessary wattage across the three ports? Would the card react any differently depending on which port a 6-pin cable was connected to?


Assuming such a card existed that had 2 8pin and 1 6pin connector, yes it would be able to adapt as you say and draw current from all 3 at the same time. However if you’re asking what would happen if you hypothetically plugged 2 8pin connectors and then decided to plug 1 6pin connector into the card, what would happen is it simply wouldn’t boot and give you an error message telling to to check your power cables. Even though the 2 additional pins on an 8pin connector are only additional ground wires and don’t actually supply any current, the card will not allow you to boot if they are not detected. 


 

i9 10850K @5Ghz H2O.........................Ryzen 7 5800X @4.7Ghz
PNY XLR8 RTX 3090 H2O......................EVGA RTX 3070 XC3 Ultra
Viotek SUW49C 32:9 Ultra Wide............Oculus Rift S
Gigabyte Z490 Aorus Elite AC................ASUS TUF Gaming X570 WiFi
32GB Dominator Platinum 4000Mhz.......32GB OLOy Warhawk 3600Mhz
EVGA G3 SuperNova 1000w..................EVGA G3 SuperNova 750w
#13
jankerson
SSC Member
  • Total Posts : 710
  • Reward points : 0
  • Joined: 2017/07/13 06:50:53
  • Status: online
  • Ribbons : 1
Re: What is the order of power draw across the 3x power connectors? 2020/10/29 03:46:01 (permalink)
Coldblackice
jankerson
When the GPU is just idling it uses one 8 Pin.
 
However once the GPU is actually being used in a game as an example all 3 connections are used.
 
The last two kick in at the same time.
 
I know this because I can see what is happening and how it works with my PSU.
 
I have Realtime monitoring by rail (12 Rails) on my PSU. 
 
 
That said:
 
if you have a PSU that doesn't have the proper connections then one needs to buy a new PSU.
 
If it doesn't have 3x 8 Pin connectors it's either low quality and or too old and needs to be replaced.



The reason I ask isn't because my PSU (Corsair RMx850) doesn't have the connections available, it's a question if I only had 2x 8-pin cables + 1x 6-pin cable available, wondering how the GPU would respond. I realize I could short the two extra pins (sense + ground) on the GPU together so the card knows it can draw the full 150W over the 6-pins (all three 12v pins + grounds being connected), but instead of doing that I'm wondering if the card would be able to "adapt" with two full 8-pins and a 75W 6-pin, making it unnecessary to buy + wait for a new 8-pin cable.
 
CraptacularOne
 
That's not how it works at all and no, your PSU doesn't have 12 rails. Furthermore no, if a PSU doesn't have 3 8pin connectors doesn't mean it's too old or poor quality. Please stop posting nonsense and stating it as fact when you have no idea what you're talking about. 
 
For starters your PSU has a single large 12v rail
https://www.kitguru.net/components/power-supplies/zardon/corsair-ax1600i-digital-power-supply-review/3/
 
Secondly no, it will not start at one of the 8 pin connectors and activate the other 2 later. The card will in fact be drawing power from all available power inputs simultaneously at any given state be it idle or load. It will balance that load between all available power inputs to their allowances but often will not pull more than 75w from the PCI-E slot as a fail safe so you don't risk melting your 24pin ATX connector or damaging the motherboard that isn't designed to feed large amounts of power though the PCI-E slot. 
 

How would the card react if two 8-pin cables + one 6-pin were connected? Would it be able to adapt by balancing the necessary wattage across the three ports? Would the card react any differently depending on which port a 6-pin cable was connected to?




 
Are you sure?
 
The RMX 850 comes with 3x Daisy chained PCIe cables, for a total of 6x 6+2 connections.
 
If you lost a cable you can contact Corsair or go on their website and buy cables for your PSU.
 
Direct link for the stock PCIe cables.
 
https://www.corsair.com/u...ail-Cable/p/CP-8920114
post edited by jankerson - 2020/10/29 04:33:10

i9 9900K @ 5.0 GHz, NH D15, 32 GB GSKILL Trident Z RGB, AORUS Z390 MASTER, EVGA RTX 3080 FTW3 Ultra, Samsung 970 EVO Plus 500GB, Samsung 860 EVO 1TB, Samsung 860 EVO 500GB, ASUS ROG Swift PG279Q, Steel Series APEX PRO, Logitech Gaming Pro Mouse, CM Master Case 5, Corsair AXI 1600W.
 
i7 8086K, AORUS Z370 Gaming 5, 16GB GSKILL RJV 3200, EVGA 2080TI FTW3 Ultra, Samsung 970 EVO 250GB, (2)SAMSUNG 860 EVO 500 GB, Acer Predator XB1 XB271HU, Corsair HXI 850W.
 
i7 8700K, AORUS Z370 Ultra Gaming, 16GB 16GB DDR4 3000, EVGA 1080Ti FTW3 Ultra, Samsung 960 EVO 250GB, Corsair HX 850W.
#14
jankerson
SSC Member
  • Total Posts : 710
  • Reward points : 0
  • Joined: 2017/07/13 06:50:53
  • Status: online
  • Ribbons : 1
Re: What is the order of power draw across the 3x power connectors? 2020/10/29 03:50:41 (permalink)
CraptacularOne
Coldblackice
jankerson
When the GPU is just idling it uses one 8 Pin.
 
However once the GPU is actually being used in a game as an example all 3 connections are used.
 
The last two kick in at the same time.
 
I know this because I can see what is happening and how it works with my PSU.
 
I have Realtime monitoring by rail (12 Rails) on my PSU. 
 
 
That said:
 
if you have a PSU that doesn't have the proper connections then one needs to buy a new PSU.
 
If it doesn't have 3x 8 Pin connectors it's either low quality and or too old and needs to be replaced.



The reason I ask isn't because my PSU (Corsair RMx850) doesn't have the connections available, it's a question if I only had 2x 8-pin cables + 1x 6-pin cable available, wondering how the GPU would respond. I realize I could short the two extra pins (sense + ground) on the GPU together so the card knows it can draw the full 150W over the 6-pins (all three 12v pins + grounds being connected), but instead of doing that I'm wondering if the card would be able to "adapt" with two full 8-pins and a 75W 6-pin, making it unnecessary to buy + wait for a new 8-pin cable.
 
CraptacularOne
 
That's not how it works at all and no, your PSU doesn't have 12 rails. Furthermore no, if a PSU doesn't have 3 8pin connectors doesn't mean it's too old or poor quality. Please stop posting nonsense and stating it as fact when you have no idea what you're talking about. 
 
For starters your PSU has a single large 12v rail
https://www.kitguru.net/components/power-supplies/zardon/corsair-ax1600i-digital-power-supply-review/3/
 
Secondly no, it will not start at one of the 8 pin connectors and activate the other 2 later. The card will in fact be drawing power from all available power inputs simultaneously at any given state be it idle or load. It will balance that load between all available power inputs to their allowances but often will not pull more than 75w from the PCI-E slot as a fail safe so you don't risk melting your 24pin ATX connector or damaging the motherboard that isn't designed to feed large amounts of power though the PCI-E slot. 
 

How would the card react if two 8-pin cables + one 6-pin were connected? Would it be able to adapt by balancing the necessary wattage across the three ports? Would the card react any differently depending on which port a 6-pin cable was connected to?


Assuming such a card existed that had 2 8pin and 1 6pin connector, yes it would be able to adapt as you say and draw current from all 3 at the same time. However if you’re asking what would happen if you hypothetically plugged 2 8pin connectors and then decided to plug 1 6pin connector into the card, what would happen is it simply wouldn’t boot and give you an error message telling to to check your power cables. Even though the 2 additional pins on an 8pin connector are only additional ground wires and don’t actually supply any current, the card will not allow you to boot if they are not detected. 


 




 
I heard..... I am not going to try it.... That you don't actually need all 3 connected for the card to boot.
 
That's what I heard and what some people have been saying... Mostly the same ones who under recommend PSUs so that goes hand in hand with that. Same with not plugging in both EPS connections etc.
 
They tell people if you aren't overclocking they don't need the 3rd 8 Pin. LOL
 
Basically they just tell people they don't need to plug in things if they don't have enough PSU to have the connections. 
 
I see it almost daily....
 
EDIT:
 
I did pull one 8 pin to see if would boot, just for my data.
 
NOPE, the card won't even start without all 3x 8 pins connected.
 
Cool, that's what I thought.
 
 
 
 
 
post edited by jankerson - 2020/10/29 06:10:32

i9 9900K @ 5.0 GHz, NH D15, 32 GB GSKILL Trident Z RGB, AORUS Z390 MASTER, EVGA RTX 3080 FTW3 Ultra, Samsung 970 EVO Plus 500GB, Samsung 860 EVO 1TB, Samsung 860 EVO 500GB, ASUS ROG Swift PG279Q, Steel Series APEX PRO, Logitech Gaming Pro Mouse, CM Master Case 5, Corsair AXI 1600W.
 
i7 8086K, AORUS Z370 Gaming 5, 16GB GSKILL RJV 3200, EVGA 2080TI FTW3 Ultra, Samsung 970 EVO 250GB, (2)SAMSUNG 860 EVO 500 GB, Acer Predator XB1 XB271HU, Corsair HXI 850W.
 
i7 8700K, AORUS Z370 Ultra Gaming, 16GB 16GB DDR4 3000, EVGA 1080Ti FTW3 Ultra, Samsung 960 EVO 250GB, Corsair HX 850W.
#15
Frammish
Superclocked Member
  • Total Posts : 225
  • Reward points : 0
  • Joined: 2014/10/18 15:24:44
  • Status: offline
  • Ribbons : 0
Re: What is the order of power draw across the 3x power connectors? 2020/10/29 07:17:38 (permalink)
Craptacular, you really ought to mellow out. I see you frequently attacking other posters here loudly proclaiming they don’t know what they are talking about. Sometimes I agree. Other times you show your own ignorance. In this case, I think jankerson is correct though I don’t have direct knowledge. He posted screenshots of his software and what he said makes complete sense.
 
Please take it down a notch. It’s offensive.
post edited by Frammish - 2020/10/29 07:19:59
#16
jankerson
SSC Member
  • Total Posts : 710
  • Reward points : 0
  • Joined: 2017/07/13 06:50:53
  • Status: online
  • Ribbons : 1
Re: What is the order of power draw across the 3x power connectors? 2020/10/29 07:36:01 (permalink)
Frammish
Craptacular, you really ought to mellow out. I see you frequently attacking other posters here loudly proclaiming they don’t know what they are talking about. Sometimes I agree. Other times you show your own ignorance. In this case, I think jankerson is correct though I don’t have direct knowledge. He posted screenshots of his software and what he said makes complete sense.
 
Please take it down a notch. It’s offensive.




 
Technology can be a great thing. 
 
I like it because it does show real power draw per rail, and that's directly from the PSU from a direct hardware link. That's actually communicating with the PSU in real time.
 
My HXI 850W didn't show this kind of information, not this detailed. It showed, power in, power out, efficiency, status of the 12V, 5V, 3.3V and fan speed. 
 
The AXI shows MUCH more information and also gives a lot more control over the PSU.
 
Not everyone needs it or even wants it, but I find it useful. 
 
 
 
 

i9 9900K @ 5.0 GHz, NH D15, 32 GB GSKILL Trident Z RGB, AORUS Z390 MASTER, EVGA RTX 3080 FTW3 Ultra, Samsung 970 EVO Plus 500GB, Samsung 860 EVO 1TB, Samsung 860 EVO 500GB, ASUS ROG Swift PG279Q, Steel Series APEX PRO, Logitech Gaming Pro Mouse, CM Master Case 5, Corsair AXI 1600W.
 
i7 8086K, AORUS Z370 Gaming 5, 16GB GSKILL RJV 3200, EVGA 2080TI FTW3 Ultra, Samsung 970 EVO 250GB, (2)SAMSUNG 860 EVO 500 GB, Acer Predator XB1 XB271HU, Corsair HXI 850W.
 
i7 8700K, AORUS Z370 Ultra Gaming, 16GB 16GB DDR4 3000, EVGA 1080Ti FTW3 Ultra, Samsung 960 EVO 250GB, Corsair HX 850W.
#17
CraptacularOne
Omnipotent Enthusiast
  • Total Posts : 13140
  • Reward points : 0
  • Joined: 2006/06/12 17:20:44
  • Location: Florida
  • Status: online
  • Ribbons : 181
Re: What is the order of power draw across the 3x power connectors? 2020/10/29 08:57:55 (permalink)
Frammish
Craptacular, you really ought to mellow out. I see you frequently attacking other posters here loudly proclaiming they don’t know what they are talking about. Sometimes I agree. Other times you show your own ignorance. In this case, I think jankerson is correct though I don’t have direct knowledge. He posted screenshots of his software and what he said makes complete sense.
 
Please take it down a notch. It’s offensive.


This is why I have no patience, when some uninformed "person" posts something he has no idea of what he's talking about as fact then refuses to do the simple thing I'm telling him to do (open GPUZ sensor tab) to see he's wrong all the while putting his hands over his ears and going "la la la I don't hear anything but the sound of my own ignorance". Then you have people like yourself who also have no idea what they are talking about start to agree with the wrong person and that's how nonsense perpetuates itself. 
 
He is completely wrong and the mere fact that he thinks a bloatware piece of garbage like iCUE is correct is either hilarious or sad, I haven't decided. I was going to just walk away from this and focus on the OP and try to give him the proper guidance and information he asked for but when you post and start trying to tell me to take it down a notch and that I'm being offense for giving him the CORRECT information, well that just pisses me off. 
 
Anyone that wants to see for themselves it's there for you in GPUZ. Open the app, go to sensor tab and it'll tell you approximately what's being drawn from where. At no point ever will you see no current being drawn from any of the input sources be it idle or load. Neither will you see it load up one at a time. When your card needs more power it will draw from ALL available inputs simultaneously.

i9 10850K @5Ghz H2O.........................Ryzen 7 5800X @4.7Ghz
PNY XLR8 RTX 3090 H2O......................EVGA RTX 3070 XC3 Ultra
Viotek SUW49C 32:9 Ultra Wide............Oculus Rift S
Gigabyte Z490 Aorus Elite AC................ASUS TUF Gaming X570 WiFi
32GB Dominator Platinum 4000Mhz.......32GB OLOy Warhawk 3600Mhz
EVGA G3 SuperNova 1000w..................EVGA G3 SuperNova 750w
#18
LFaWolf
FTW Member
  • Total Posts : 1571
  • Reward points : 0
  • Joined: 2012/05/09 15:51:44
  • Location: Northern California
  • Status: offline
  • Ribbons : 3
Re: What is the order of power draw across the 3x power connectors? 2020/10/29 10:16:16 (permalink)
jankerson
 
Are you sure?
 
The RMX 850 comes with 3x Daisy chained PCIe cables, for a total of 6x 6+2 connections.
 
If you lost a cable you can contact Corsair or go on their website and buy cables for your PSU.
 
Direct link for the stock PCIe cables.
 
https://www.corsair.com/u...ail-Cable/p/CP-8920114




I have the RMx 850 and it does come with 3x 6+2 cables. However, it seems the link that you have is for  AXi, CXM, HX, TXM and not for RMx. Have to be careful and be sure it is the right cable/ pin out and it could fry the card or the PSU.

My Affiliate Code: WF7SIE2ZR9


#19
jankerson
SSC Member
  • Total Posts : 710
  • Reward points : 0
  • Joined: 2017/07/13 06:50:53
  • Status: online
  • Ribbons : 1
Re: What is the order of power draw across the 3x power connectors? 2020/10/29 10:24:01 (permalink)
LFaWolf
jankerson
 
Are you sure?
 
The RMX 850 comes with 3x Daisy chained PCIe cables, for a total of 6x 6+2 connections.
 
If you lost a cable you can contact Corsair or go on their website and buy cables for your PSU.
 
Direct link for the stock PCIe cables.
 
https://www.corsair.com/u...ail-Cable/p/CP-8920114




I have the RMx 850 and it does come with 3x 6+2 cables. However, it seems the link that you have is for  AXi, CXM, HX, TXM and not for RMx. Have to be careful and be sure it is the right cable/ pin out and it could fry the card or the PSU.




 
Type 3 or Type 4 PCIe Cables for the RMX. The only difference is the caps in the cables for the TYPE 4.
 
Check this link, copy and paste IN your browser, it's shorted the link so I had to do it this way for it to work.
 
www.corsair.com/us/en/psu-cable-compatibility
 
I wouldn't give the wrong info.
 
 
post edited by jankerson - 2020/10/29 10:38:03

i9 9900K @ 5.0 GHz, NH D15, 32 GB GSKILL Trident Z RGB, AORUS Z390 MASTER, EVGA RTX 3080 FTW3 Ultra, Samsung 970 EVO Plus 500GB, Samsung 860 EVO 1TB, Samsung 860 EVO 500GB, ASUS ROG Swift PG279Q, Steel Series APEX PRO, Logitech Gaming Pro Mouse, CM Master Case 5, Corsair AXI 1600W.
 
i7 8086K, AORUS Z370 Gaming 5, 16GB GSKILL RJV 3200, EVGA 2080TI FTW3 Ultra, Samsung 970 EVO 250GB, (2)SAMSUNG 860 EVO 500 GB, Acer Predator XB1 XB271HU, Corsair HXI 850W.
 
i7 8700K, AORUS Z370 Ultra Gaming, 16GB 16GB DDR4 3000, EVGA 1080Ti FTW3 Ultra, Samsung 960 EVO 250GB, Corsair HX 850W.
#20
LFaWolf
FTW Member
  • Total Posts : 1571
  • Reward points : 0
  • Joined: 2012/05/09 15:51:44
  • Location: Northern California
  • Status: offline
  • Ribbons : 3
Re: What is the order of power draw across the 3x power connectors? 2020/10/29 12:15:01 (permalink)
jankerson
LFaWolf
jankerson
 
Are you sure?
 
The RMX 850 comes with 3x Daisy chained PCIe cables, for a total of 6x 6+2 connections.
 
If you lost a cable you can contact Corsair or go on their website and buy cables for your PSU.
 
Direct link for the stock PCIe cables.
 
https://www.corsair.com/u...ail-Cable/p/CP-8920114




I have the RMx 850 and it does come with 3x 6+2 cables. However, it seems the link that you have is for  AXi, CXM, HX, TXM and not for RMx. Have to be careful and be sure it is the right cable/ pin out and it could fry the card or the PSU.




 
Type 3 or Type 4 PCIe Cables for the RMX. The only difference is the caps in the cables for the TYPE 4.
 
Check this link, copy and paste IN your browser, it's shorted the link so I had to do it this way for it to work.
 
www.corsair.com/us/en/psu-cable-compatibility
 
I wouldn't give the wrong info.
 
 


That is a good link and chart. Good info to keep!
 

My Affiliate Code: WF7SIE2ZR9


#21
Frammish
Superclocked Member
  • Total Posts : 225
  • Reward points : 0
  • Joined: 2014/10/18 15:24:44
  • Status: offline
  • Ribbons : 0
Re: What is the order of power draw across the 3x power connectors? 2020/10/29 13:29:31 (permalink)
CraptacularOne
This is why I have no patience, when some uninformed "person" posts something he has no idea of what he's talking about as fact then refuses to do the simple thing I'm telling him to do (open GPUZ sensor tab) to see he's wrong all the while putting his hands over his ears and going "la la la I don't hear anything but the sound of my own ignorance". Then you have people like yourself who also have no idea what they are talking about start to agree with the wrong person and that's how nonsense perpetuates itself. 
 
He is completely wrong and the mere fact that he thinks a bloatware piece of garbage like iCUE is correct is either hilarious or sad, I haven't decided. I was going to just walk away from this and focus on the OP and try to give him the proper guidance and information he asked for but when you post and start trying to tell me to take it down a notch and that I'm being offense for giving him the CORRECT information, well that just pisses me off. 
 
Anyone that wants to see for themselves it's there for you in GPUZ. Open the app, go to sensor tab and it'll tell you approximately what's being drawn from where. At no point ever will you see no current being drawn from any of the input sources be it idle or load. Neither will you see it load up one at a time. When your card needs more power it will draw from ALL available inputs simultaneously.




 
I didn’t have a dog in this fight but now I do. You’re simply wrong. Let me explain why.
 
https://www.youtube.com/watch?v=FDLWWvXJ0Q0
 
That is a video promo for the Corsair supply jankerson mentioned. I don’t know the proper terminology but they themselves call the outputs “rails”. Jankerson is only using the same language Corsair is using. But forgetting that, they have to call each output something because each can be monitored. Yeah, it’s one big 12V supply, one big 5V supply. And maybe a 3V. But from what I can tell, there’s current monitoring for each cable. All you do is hang a current sense resistor off return/ground for each cable and it is absolutely trivial to have a microcontroller monitor, measure, and report the individual currents and voltages. It’s touted as a feature. You think they are just having a random number generator spew numbers that mean nothing? Jankerson is seeing data from his power supply through software designed specifically to report those values. The capability jankerson mentioned and reported is absolutely trivial to do.
 
I don’t care if iCUE is bloatware or not. That does not even matter to this discussion. It either does or does not report current values. Sure looks like it does to me.
 
I never said providing information is offensive. You attacking people right out of the gate, over and over, and now me for calling you out politely is what is offensive. Do whatever you want with GPUZ. Look at sensors all you want. Between a power supply that measures currents directly and guessing what sensor is measuring what in GPUZ, I think I trust jankerson to have the real story. What would be nice is engineers who actually know the circuit commenting. In the mean time, I tend to think, again, you don’t know what you’re talking about and jankerson does.
 
I don’t have that Corsair supply so can’t test this myself. It just seems to me that purpose-built hardware with a documented measurement capability/feature intended to make these kinds of measurements has the higher probability of telling the tale here. Maybe there’s some other difference that explains why you think you are seeing one thing and jankerson is seeing another. Good on you for trying to find out why there is a difference, except you didn’t.
 
Meanwhile, you should take it down a notch. Your behavior is offensive. There are better ways to sort out why you are seeing different things than jankerson. And honestly, jankerson tends to show a bit more technical expertise in his posts than you do. You just try to shout people down.
#22
CraptacularOne
Omnipotent Enthusiast
  • Total Posts : 13140
  • Reward points : 0
  • Joined: 2006/06/12 17:20:44
  • Location: Florida
  • Status: online
  • Ribbons : 181
Re: What is the order of power draw across the 3x power connectors? 2020/10/29 13:47:58 (permalink)
Frammish
CraptacularOne
This is why I have no patience, when some uninformed "person" posts something he has no idea of what he's talking about as fact then refuses to do the simple thing I'm telling him to do (open GPUZ sensor tab) to see he's wrong all the while putting his hands over his ears and going "la la la I don't hear anything but the sound of my own ignorance". Then you have people like yourself who also have no idea what they are talking about start to agree with the wrong person and that's how nonsense perpetuates itself. 
 
He is completely wrong and the mere fact that he thinks a bloatware piece of garbage like iCUE is correct is either hilarious or sad, I haven't decided. I was going to just walk away from this and focus on the OP and try to give him the proper guidance and information he asked for but when you post and start trying to tell me to take it down a notch and that I'm being offense for giving him the CORRECT information, well that just pisses me off. 
 
Anyone that wants to see for themselves it's there for you in GPUZ. Open the app, go to sensor tab and it'll tell you approximately what's being drawn from where. At no point ever will you see no current being drawn from any of the input sources be it idle or load. Neither will you see it load up one at a time. When your card needs more power it will draw from ALL available inputs simultaneously.




 
I didn’t have a dog in this fight but now I do. You’re simply wrong. Let me explain why.
 
https://www.youtube.com/watch?v=FDLWWvXJ0Q0
 
That is a video promo for the Corsair supply jankerson mentioned. I don’t know the proper terminology but they themselves call the outputs “rails”. Jankerson is only using the same language Corsair is using. But forgetting that, they have to call each output something because each can be monitored. Yeah, it’s one big 12V supply, one big 5V supply. And maybe a 3V. But from what I can tell, there’s current monitoring for each cable. All you do is hang a current sense resistor off return/ground for each cable and it is absolutely trivial to have a microcontroller monitor, measure, and report the individual currents and voltages. It’s touted as a feature. You think they are just having a random number generator spew numbers that mean nothing? Jankerson is seeing data from his power supply through software designed specifically to report those values. The capability jankerson mentioned and reported is absolutely trivial to do.
 
I don’t care if iCUE is bloatware or not. That does not even matter to this discussion. It either does or does not report current values. Sure looks like it does to me.
 
I never said providing information is offensive. You attacking people right out of the gate, over and over, and now me for calling you out politely is what is offensive. Do whatever you want with GPUZ. Look at sensors all you want. Between a power supply that measures currents directly and guessing what sensor is measuring what in GPUZ, I think I trust jankerson to have the real story. What would be nice is engineers who actually know the circuit commenting. In the mean time, I tend to think, again, you don’t know what you’re talking about and jankerson does.
 
I don’t have that Corsair supply so can’t test this myself. It just seems to me that purpose-built hardware with a documented measurement capability/feature intended to make these kinds of measurements has the higher probability of telling the tale here. Maybe there’s some other difference that explains why you think you are seeing one thing and jankerson is seeing another. Good on you for trying to find out why there is a difference, except you didn’t.
 
Meanwhile, you should take it down a notch. Your behavior is offensive. There are better ways to sort out why you are seeing different things than jankerson. And honestly, jankerson tends to show a bit more technical expertise in his posts than you do. You just try to shout people down.


I can't believe the amount of stupidity being regurgitated here. I know full well how the AX 1600i works and it's "software" rails. The matter of FACT is that what he is stating is WRONG. There are no 2 ways about it. The way a video card works and the PSU suppling it power is it will draw from all sources simultaneously as load demand is increased. It won't load one 8 pin before or after any other connector it will use them ALL SIMULTANEOUSLY ALL THE TIME. This is not up for debate. 
 
I guess he should go do a write up on an electrical engineering site on how he discovered a new way current draw works. 
 
Just stop with the stupidity do you really think EVERYONE else is wrong and only he is right? Go ask Steve Burke at GN, or message TiN here on EVGA forums and ask him how current draw works on video cards. If he doesn't laugh you and him off the forums he will tell you what I've been telling you both here all along. CURRENT IS DRAWN FROM ALL AVAILABLE SOURCES SIMULTANEOUSLY always. 

i9 10850K @5Ghz H2O.........................Ryzen 7 5800X @4.7Ghz
PNY XLR8 RTX 3090 H2O......................EVGA RTX 3070 XC3 Ultra
Viotek SUW49C 32:9 Ultra Wide............Oculus Rift S
Gigabyte Z490 Aorus Elite AC................ASUS TUF Gaming X570 WiFi
32GB Dominator Platinum 4000Mhz.......32GB OLOy Warhawk 3600Mhz
EVGA G3 SuperNova 1000w..................EVGA G3 SuperNova 750w
#23
Frammish
Superclocked Member
  • Total Posts : 225
  • Reward points : 0
  • Joined: 2014/10/18 15:24:44
  • Status: offline
  • Ribbons : 0
Re: What is the order of power draw across the 3x power connectors? 2020/10/29 14:02:02 (permalink)
I don’t have the Corsair supply to verify this but may know what is going on. I downloaded the most recent CPUZ and on my 3090 FTW3 Ultra it does indeed show the 1st 8-pin pulling the most power though 2nd and 3rd also are pulling just a little bit - just a few watts - according to CPUZ without any graphics apps running. Without knowing the specs on the Corsair measurements, at low wattages, it could just report 0W. There’s digitization error and offsets that could affect the measurements. The supply has to be able to measure peak currents and may not care about the weeds at low currents.

But, Craptacular, I am seeing what jankerson reported. Connector 1 is pulling more current/power than the other two - using GPUZ. Currents pick up on the other two connectors as the load goes up, again, just as jankerson said.
 
Without other measurements or information, it’s impossible to say that the Corsair isn’t properly reporting at low currents and instead is calling them 0. It could be offset error in the circuit or step size and digitization error.
 
And we can say similar about GPUZ and the sensors. It could be there is an offset in the other direction in the card measurement circuit that makes GPUZ report 0 currents/powers as some non-zero value.
 
And that’s the thing. We have two different kinds of measurements reporting basically the same thing - one connector is supplying more power than the other two for some reason, and power picks up on those other two connectors as load increases.
 
Craptastic said:
 
“Secondly no, it will not start at one of the 8 pin connectors and activate the other 2 later. The card will in fact be drawing power from all available power inputs simultaneously at any given state be it idle or load. It will balance that load between all available power inputs to their allowances...”
 
Using your own favorite measurement technique with GPUZ, I don’t see what you claim here. I see the opposite. I see results in line with jankerson’s. Not yours.
 
 
 
 
#24
Frammish
Superclocked Member
  • Total Posts : 225
  • Reward points : 0
  • Joined: 2014/10/18 15:24:44
  • Status: offline
  • Ribbons : 0
Re: What is the order of power draw across the 3x power connectors? 2020/10/29 14:14:02 (permalink)
CraptacularOne
I can't believe the amount of stupidity being regurgitated here. I know full well how the AX 1600i works and it's "software" rails. The matter of FACT is that what he is stating is WRONG. There are no 2 ways about it. The way a video card works and the PSU suppling it power is it will draw from all sources simultaneously as load demand is increased. It won't load one 8 pin before or after any other connector it will use them ALL SIMULTANEOUSLY ALL THE TIME. This is not up for debate. 
 
I guess he should go do a write up on an electrical engineering site on how he discovered a new way current draw works. 
 
Just stop with the stupidity do you really think EVERYONE else is wrong and only he is right? Go ask Steve Burke at GN, or message TiN here on EVGA forums and ask him how current draw works on video cards. If he doesn't laugh you and him off the forums he will tell you what I've been telling you both here all along. CURRENT IS DRAWN FROM ALL AVAILABLE SOURCES SIMULTANEOUSLY always. 



Uh no. You stop with the stupidity. I did your suggested measurement using GPUZ and saw results consistent with jankerson’s. Not what you claim here.
 
Maybe you should try your own measurement.


But Craptastic, how could a video card pull more current from one connector than the other two at low power but approximately equal power at high powers? You obviously don’t know know, do you?
 
I have no idea why the card designers would sequence power like that. Maybe for heat reasons or some other reason, but it isn’t hard to do. Either in hardware or in the controllers for the three incoming rails. Look up circuits that balance power. Any resistance difference between supplies could lead to uncontrolled overloads on the remaining circuits. This stuff isn’t hard. It’s common if you actually work with electronics.
 
What I do know is using your preferred technique, I see what jankerson saw. I definitely don’t see what you are claiming. It’s different enough that I have to wonder if you have tried this yourself or are just talking out your behind while being really offensive.
 
No more time or desire to argue with you. I tried it and what I saw is not what you claim. I would suggest anyone else curious tries it and sees for themselves. My 3090 FTW3 Ultra and GPUZ says Craptastic doesn’t know what he is talking about. A more courteous Craptastic would try to figure out why he is seeing what he is seeing instead of just yelling at everyone else they are wrong. From here, it looks like Craptastic is living up to his moniker.
 
Good day.
post edited by Frammish - 2020/10/29 14:16:19
#25
CraptacularOne
Omnipotent Enthusiast
  • Total Posts : 13140
  • Reward points : 0
  • Joined: 2006/06/12 17:20:44
  • Location: Florida
  • Status: online
  • Ribbons : 181
Re: What is the order of power draw across the 3x power connectors? 2020/10/29 14:39:35 (permalink)
I can't believe I'm still entertaining this garbage.
 
This is my RTX 3090 with default 375w BIOS. Starts at idle while Port Royal is loading then to full load. 
https://www.youtube.com/watch?v=J227d4qC8e8
 
With that I'm done here. But I really encourage you both to learn how power supplies work and how cards pulling current from them work. All input sources will be tapped simultaneously be it at idle or load, this is a fact, not an opinion or theory. You want to dispute it? Ill be waiting for your white paper to be written up. 
 
EDIT: LMAO I just noticed I'm the only one here with a Blue Ribbon awarded here for my CORRECT information being posted.
post edited by Sajin - 2020/10/29 14:47:18

i9 10850K @5Ghz H2O.........................Ryzen 7 5800X @4.7Ghz
PNY XLR8 RTX 3090 H2O......................EVGA RTX 3070 XC3 Ultra
Viotek SUW49C 32:9 Ultra Wide............Oculus Rift S
Gigabyte Z490 Aorus Elite AC................ASUS TUF Gaming X570 WiFi
32GB Dominator Platinum 4000Mhz.......32GB OLOy Warhawk 3600Mhz
EVGA G3 SuperNova 1000w..................EVGA G3 SuperNova 750w
#26
Sajin
EVGA Forum Moderator
  • Total Posts : 43176
  • Reward points : 0
  • Joined: 2010/06/07 21:11:51
  • Location: Texas, USA.
  • Status: online
  • Ribbons : 197
Re: What is the order of power draw across the 3x power connectors? 2020/10/29 14:45:37 (permalink)
No personal attacks people.

Want to save 5 to 10% on your next EVGA purchase? Just click on the associates banner to save, or enter the associates code at checkout on your next purchase. If you choose to use my code I want to personally say "Thank You" for using it.
 

 
#27
xitywampas
New Member
  • Total Posts : 9
  • Reward points : 0
  • Joined: 2010/09/25 02:18:54
  • Status: offline
  • Ribbons : 0
Re: What is the order of power draw across the 3x power connectors? 2020/10/29 15:50:35 (permalink)
1: Corsair CP-9020087-NA is a single rail PSU.

2: All of the connections will draw power. Unless the circuit is opened it will draw power. Current draw will not be exactly even but will spread out across the circuit depending on individual resistance per connection. One connection will have a higher draw because the connections are not perfect and will have variation. In other words, the current will take the path of least resistance. My card shows port 2 as the high power draw as it probably has the least resistance to flow. I take these and any software numbers generated inside the OS with a grain of salt.

3. Software measuring will never be %100 accurate. If you want to see this accurately it must be an inline measurement system or an inductive one running independently of the system being measured. Everything else should be considered marginally accurate at best.
post edited by xitywampas - 2020/10/29 15:53:24

Attached Image(s)

#28
Frammish
Superclocked Member
  • Total Posts : 225
  • Reward points : 0
  • Joined: 2014/10/18 15:24:44
  • Status: offline
  • Ribbons : 0
Re: What is the order of power draw across the 3x power connectors? 2020/10/29 16:06:45 (permalink)
Power at load isn’t what we are talking about. The effect we were discussing here was at idle and increasing. You said that the connectors all pull the same but you are only showing two of the 3 power connector sensors and your own test shows connector 1 passing 17.9W and 2 passing 12.9W in one frame (40% difference). You also see the difference in the same sequence we do with connector 1 higher than 2. If your explanation was correct, that it’s all just one big bus, you should’t see that. Even at full power, connector 1 is pulling more power than connector 2 but that could be in the realm of noise. It’s by a smaller difference than at whatever your system was doing when at the lower power, what lights, fan speeds, etc. The decimal point in GPUZ implies we can still make the comparison, though.
 
We don’t know anything about the measurement circuits like linearity, offset, bits, etc, so you have to take the data with a grain of salt, but even your data shows the same thing as we saw. Jankerson‘s power supply is a completely different and independent measurement that doesn’t involve GPUZ and yet it agrees that the connectors aren’t loaded the same. When two different methods to make a measurement agree on the measurement, it’s strong evidence it’s a good observation. The connectors do not appear to be loaded the same.
 
As power ramps up, yes, the loads do equalize more and in your run at high power, the difference appeared to go from 5W in your baseline, to about 0.5W at load. Again, you have to be careful calling that a real difference and we were talking about low power anyway. It looks like they are much more equal at high power.
 
I don’t know for sure why we see this but the measurement looks good and your video agrees. If you accept the GPUZ results, your own video proves you wrong.
#29
jankerson
SSC Member
  • Total Posts : 710
  • Reward points : 0
  • Joined: 2017/07/13 06:50:53
  • Status: online
  • Ribbons : 1
Re: What is the order of power draw across the 3x power connectors? 2020/10/29 16:20:29 (permalink)
Frammish
Power at load isn’t what we are talking about. The effect we were discussing here was at idle and increasing. You said that the connectors all pull the same but you are only showing two of the 3 power connector sensors and your own test shows connector 1 passing 17.9W and 2 passing 12.9W in one frame (40% difference). You also see the difference in the same sequence we do with connector 1 higher than 2. If your explanation was correct, that it’s all just one big bus, you should’t see that. Even at full power, connector 1 is pulling more power than connector 2 but that could be in the realm of noise. It’s by a smaller difference than at whatever your system was doing when at the lower power, what lights, fan speeds, etc. The decimal point in GPUZ implies we can still make the comparison, though.
 
We don’t know anything about the measurement circuits like linearity, offset, bits, etc, so you have to take the data with a grain of salt, but even your data shows the same thing as we saw. Jankerson‘s power supply is a completely different and independent measurement that doesn’t involve GPUZ and yet it agrees that the connectors aren’t loaded the same. When two different methods to make a measurement agree on the measurement, it’s strong evidence it’s a good observation. The connectors do not appear to be loaded the same.
 
As power ramps up, yes, the loads do equalize more and in your run at high power, the difference appeared to go from 5W in your baseline, to about 0.5W at load. Again, you have to be careful calling that a real difference and we were talking about low power anyway. It looks like they are much more equal at high power.
 
I don’t know for sure why we see this but the measurement looks good and your video agrees. If you accept the GPUZ results, your own video proves you wrong.




 
Our 3 Connectors will pull something at idle, very low wattage as you can see yourself. Since the GPU is set up to recognize if the connectors are connected or not some current is needed for that. Although very low as we all can see.
 
If it's less than 12W my PSU won't report it because it reports in AMPS, not WATTS per rail. It really is that simple.
 
Once the GPU is activated for 3d etc the card will more power and that's when all 3 connectors show actual AMP values because they are all drawing more than 12W.
 
This is all very basic stuff here so I really don't understand why it so hard for some to grasp it. 
 
I learned about AMPS, Volts, OMHS and WATTS back in middle school in the 1970's so we aren't even talking about Collège level things here.
 
All I wanted to do is pass on some simple information that I saw.
 
Should been simple, but I suppose nothing is simple anymore these days.
 
 

i9 9900K @ 5.0 GHz, NH D15, 32 GB GSKILL Trident Z RGB, AORUS Z390 MASTER, EVGA RTX 3080 FTW3 Ultra, Samsung 970 EVO Plus 500GB, Samsung 860 EVO 1TB, Samsung 860 EVO 500GB, ASUS ROG Swift PG279Q, Steel Series APEX PRO, Logitech Gaming Pro Mouse, CM Master Case 5, Corsair AXI 1600W.
 
i7 8086K, AORUS Z370 Gaming 5, 16GB GSKILL RJV 3200, EVGA 2080TI FTW3 Ultra, Samsung 970 EVO 250GB, (2)SAMSUNG 860 EVO 500 GB, Acer Predator XB1 XB271HU, Corsair HXI 850W.
 
i7 8700K, AORUS Z370 Ultra Gaming, 16GB 16GB DDR4 3000, EVGA 1080Ti FTW3 Ultra, Samsung 960 EVO 250GB, Corsair HX 850W.
#30
Page: 12 > Showing page 1 of 2
Jump to:
  • Back to Mobile