Graphite8five
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Is a single dual 8 pin PCIE cable sufficient to power a 2080 Ti FTW3 with a Seasonic Prime Ultra Platinum 1000W? I know separate cables are recommended but this is a high end PSU...
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bob16314
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Re: Dual 8 pin PCIE cable?
2019/10/18 01:00:37
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My reasoning is, is that they wouldn't make them and include the with PSUs if they weren't rated for the load (which they are)..Many people use them to reduce cable clutter and for aesthetic reasons.
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Graphite8five
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Re: Dual 8 pin PCIE cable?
2019/10/18 01:11:29
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bob16314
My reasoning is, is that they wouldn't make them and include the with PSUs if they weren't rated for the load (which they are)..Many people use them to reduce cable clutter and for aesthetic reasons.
I think you are right. I don't know why separate PCIE cables are recommended here so much, especially if they are single cable dual 8 pin cables.
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bob16314
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Re: Dual 8 pin PCIE cable?
2019/10/18 01:40:44
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It won't matter on your single +12V rail Prime Ultra Platinum 1000W that could double as an arc welder  ..It could be a problem tripping the OCP on multi +12V rail units though.
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DeadlyMercury
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Re: Dual 8 pin PCIE cable?
2019/10/18 02:04:37
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Graphite8five
bob16314
My reasoning is, is that they wouldn't make them and include the with PSUs if they weren't rated for the load (which they are)..Many people use them to reduce cable clutter and for aesthetic reasons.
I think you are right. I don't know why separate PCIE cables are recommended here so much, especially if they are single cable dual 8 pin cables.
Because less wires - more current in single wire - more heat and more stress to connector. Less wires - more resistance - more voltage drop. Due to specification you need to have 4 power wires in 6pin connector and 6 power wires (3 12v + 3 ground) in 8pin connector: because there is specific maximum current that wire can stand safely, with no harm. So gpu connectors depend on how much current plate need: one 8pin connector can stand for 150w, that mean that single wire can handle up to 4A, so if your card need 300W - it should have 2 8pin connectors. If more (like kingpin with average 360w and 520w max) - you need 3rd connector. But of course these safety standards doesn't mean that if you get 370w (like 2080ti ftw3) with 2 8pin connectors - your card will explode or something :) But if you have a single 8pin wire with same power draw - that means that current in single wire is up to 10A, that is way to much. So this wire should be 2x times thicker or it will heat up, there is will be huge stress on connector and some day it will burn up or loses it conductivity, so your card will affected by voltage drop, and that will affect card stability.
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Tris1066
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Re: Dual 8 pin PCIE cable?
2019/10/18 02:20:20
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Well, from my own experience using a Corsair HX1000i (fairly low end psu or so I'm told), with a splitter cable my 2080ti ftw3 does run, but at reduced performance (probably a drop of 10-15% in benchmarks).
Using 2 separate cables everything is fine.
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Vlada011
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Re: Dual 8 pin PCIE cable?
2019/10/18 02:34:37
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I would felt uncomfortable with single cable. 
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Hoggle
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Re: Dual 8 pin PCIE cable?
2019/10/18 02:40:20
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bob16314
My reasoning is, is that they wouldn't make them and include the with PSUs if they weren't rated for the load (which they are)..Many people use them to reduce cable clutter and for aesthetic reasons.
Keep in mind you can run them as 8 pin or as 6 pin. So the load wouldn't be as much if you used a single cable in an 8 and 6 then dual 8 pin. While it will work with a single cable often it's found that running two cables just is easier on the PSU. Also keep in mind voltage spikes are not good for the life of any electronic so making things easier on the PSU is always recommended.
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Cool GTX
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Re: Dual 8 pin PCIE cable?
2019/10/18 03:41:54
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Will it Work ? / Yes ...... however if stability issues arise - First thing I would do is go with dual PCIe cables
Stability - When you OC the Card - has been demonstrated by Many - to be impacted by a single cable
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Graphite8five
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Re: Dual 8 pin PCIE cable?
2019/10/18 03:45:26
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I might contact Seasonic and see how they feel about 380W being sent through a single dual 8 pin cable. It's their PSU so they should know.
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Graphite8five
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Re: Dual 8 pin PCIE cable?
2019/10/18 03:48:41
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Cool GTX
Will it Work ? / Yes ...... however if stability issues arise - First thing I would do is go with dual PCIe cables
Stability - When you OC the Card - has been demonstrated by Many - to be impacted by a single cable
Pairing a 2080 Ti FTW3 with a mid tier or low end PSU I could see this being issue. I think I should inquire with Seasonic about their Prime range.
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Cool GTX
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Re: Dual 8 pin PCIE cable?
2019/10/18 04:12:29
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Quality of cable construction & PSU - Amps - not - Watts - that the PSU has available .... along with the rest of your build
I run mine Rigs with OC 24/7 with EVGA 1200 P2 & the bigger systems with EVGA 1600 P2 & T2
Might just depend on how close to the edge you want to push the system
GL on your build
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Graphite8five
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Re: Dual 8 pin PCIE cable?
2019/10/18 04:49:51
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Cool GTX
Quality of cable construction & PSU - Amps - not - Watts - that the PSU has available .... along with the rest of your build
I run mine Rigs with OC 24/7 with EVGA 1200 P2 & the bigger systems with EVGA 1600 P2 & T2
Might just depend on how close to the edge you want to push the system
GL on your build
I actually just completed my custom loop with an EKWB Vector FTW3 waterblock this past weekend. Here is a picture. The two dual 8 pin cables are pretty bulky with two sets of 8 pins not being used. If it's a no go for a single dual 8 pin cable I might get 2x8 pin Cablemod custom cables.  http://www.mediafire.com/...c8fdm/Blu_Gas.jpg/file
post edited by Graphite8five - 2019/10/18 04:53:17
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Cool GTX
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Re: Dual 8 pin PCIE cable?
2019/10/18 04:52:57
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Very Nice Rig  is the LED controler part of the MB or standalone ?
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Graphite8five
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Re: Dual 8 pin PCIE cable?
2019/10/18 04:57:55
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Cool GTX
Very Nice Rig
is the LED controler part of the MB or standalone ?
Most of the LED lighting is on Corsair iCUE, I'm a big fan... I even modded both the EK Velocity and EK Vector waterblocks to run in iCUE instead of crappy Asus Aura. They both connect to my Corsair Commander Pro's lighting channels with a custom made Aura to iCUE adapter. If anyone is interested I can put you onto to the person who makes the cables.
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Cool GTX
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Re: Dual 8 pin PCIE cable?
2019/10/18 05:04:53
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Make a build Thread in Mods Rigs section and share some details of your build & changes & photos  Or you could make a Thread about your custom cable " Aura to iCUE adapter" - in Mods Rigs or General hardware section Home » All Forums » [Computer Hardware/Software] » EVGA MODS RIGS
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Graphite8five
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Re: Dual 8 pin PCIE cable?
2019/10/18 05:10:26
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Cool GTX
Make a build Thread in Mods Rigs section and share some details of your build & changes & photos
Or you could make a Thread about your custom cable " Aura to iCUE adapter" - in Mods Rigs or General hardware section
Home » All Forums » [Computer Hardware/Software] » EVGA MODS RIGS
Sure.
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GTXJackBauer
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Re: Dual 8 pin PCIE cable?
2019/10/18 08:24:35
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Graphite8five
I actually just completed my custom loop with an EKWB Vector FTW3 waterblock this past weekend. Here is a picture. The two dual 8 pin cables are pretty bulky with two sets of 8 pins not being used. If it's a no go for a single dual 8 pin cable I might get 2x8 pin Cablemod custom cables.
Nice rig. Had no idea EK made a block for the FTW3. I remember people begging EK to make them for months.
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bob16314
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Re: Dual 8 pin PCIE cable?
2019/10/18 09:42:46
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Don't forget the card can get up to 75W from the PCIe slot itself, above and beyond the rated 150W from an 8-pin and 75W from a 6-pin PCIe connector. Your unit also uses HCS terminals ( High- Current System for the MB, CPU and PCIe connectors) and related components..Each HCS terminal is rated to carry up to 11 Amps of current (132 Watts for the 3x 12V wires) for a total of 396 Watts on the 12V in an 8-pin connector. Very nice box there, by the way
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bob16314
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Re: Dual 8 pin PCIE cable?
2019/10/18 09:49:12
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DeadlyMercury
Because less wires - more current in single wire - more heat and more stress to connector. Less wires - more resistance - more voltage drop.
Due to specification you need to have 4 power wires in 6pin connector and 6 power wires (3 12v + 3 ground) in 8pin connector: because there is specific maximum current that wire can stand safely, with no harm. So gpu connectors depend on how much current plate need: one 8pin connector can stand for 150w, that mean that single wire can handle up to 4A, so if your card need 300W - it should have 2 8pin connectors. If more (like kingpin with average 360w and 520w max) - you need 3rd connector.
But of course these safety standards doesn't mean that if you get 370w (like 2080ti ftw3) with 2 8pin connectors - your card will explode or something :) But if you have a single 8pin wire with same power draw - that means that current in single wire is up to 10A, that is way to much. So this wire should be 2x times thicker or it will heat up, there is will be huge stress on connector and some day it will burn up or loses it conductivity, so your card will affected by voltage drop, and that will affect card stability.
Cool story, bro.
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timbalistea
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Re: Dual 8 pin PCIE cable?
2019/10/18 10:01:44
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The manual for my Seasonic said to use two different connectors for GPUs over 175w. It's a 620w Bronze, though, so that may change things.
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castrator86
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Re: Dual 8 pin PCIE cable?
2019/10/18 11:08:09
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You're spending a lot of money to be getting lazy, by not wanting to run a second PCI-e cable.
Would you rather it pop the rail and explode your card & PSU or would you rather have 2 separate cables that the card will never max out the power draw?
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Sajin
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Re: Dual 8 pin PCIE cable?
2019/10/18 11:19:29
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flyinion
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Re: Dual 8 pin PCIE cable?
2019/10/18 11:20:15
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So I have the gold version of that PSU and the quickstart guide says not to use the second connector on cards rated for more than 215W. I'm assuming the Platinum is going to be similar, but they don't put the quickstart guide online, just the main manual and a datasheet neither of which has that info. Anyway, just putting it out there as an FYI. I did end up with a bridged 8+8 pin cable from cablemods in my build, but before that I just zip tied the extra connector to the cable and ran two PCIE cables from the PSU. You can try just the one, but if there's any issues with power, they're probably going to tell you to run a second cable as a first step in trying to fix it.
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tattude69
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Re: Dual 8 pin PCIE cable?
2019/10/18 11:25:51
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you could use a powerlink to clean up wires, or remove the pigtails for a cleaner look, I would follow evga's advice on 2 separate wires, Seasonic wont replace your gpu if it has an issue from using 1 wire nice build 
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bob16314
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Re: Dual 8 pin PCIE cable?
2019/10/18 12:11:53
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Sajin
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Re: Dual 8 pin PCIE cable?
2019/10/18 12:36:41
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castrator86
You're spending a lot of money to be getting lazy, by not wanting to run a second PCI-e cable.
Would you rather it pop the rail and explode your card & PSU or would you rather have 2 separate cables that the card will never max out the power draw?
+1
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bob16314
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Re: Dual 8 pin PCIE cable?
2019/10/18 12:43:37
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castrator86
Would you rather it pop the rail and explode your card & PSU or would you rather have 2 separate cables that the card will never max out the power draw?
That'll never happen with a 1000W single-rail unit with 83A on the 12V..Ever.
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Sajin
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Re: Dual 8 pin PCIE cable?
2019/10/18 12:53:26
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castrator86
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Re: Dual 8 pin PCIE cable?
2019/10/18 12:56:38
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bob16314
castrator86
Would you rather it pop the rail and explode your card & PSU or would you rather have 2 separate cables that the card will never max out the power draw?
That'll never happen with a 1000W single-rail unit with 83A on the 12V..Ever.
You're not wrong. It should NEVER happen. But I've seen weirder things.
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