Regeren
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I have a power supply. With the following cables..
It has two PCI E 6 + 2 connectors. But since the 3080Ti has three 8 pin PCI E connectors, and it will not power up without the third one connected, correct?
This is what else I have. I have a main 4 pin molex cable that has 4 molex 4 pin connectors daisy chained on it.. And two separate sets of cables that each have two SATA connectors, daisychain mounted.
Asking for advice for that third PCI E 8 PIN connector. It's supposedly okay to use two of the Molex into a 2 to 1 PCI E-8pin adapter and just plug that into the third connector, which would be just extra power. correct?
This is a temporary solution until I upgrade my whole system so I would just be undervolting the card as well for about six months. Make sure it doesn't run over 300 or so Watts which should easily be covered since the 2 8 pin connectors plus the motherboard is 375 watts alone.
I did speak to the power supply manufacturer and asked tech support. And I'll relate what they said after I hear what you all advise because the tech person did not seem like a real expert.
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KingEngineRevUp
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Re: Power connector setup for 3080Ti FTW
2021/07/27 16:58:24
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It would be easier if you just shared your PSU maker.
And it will power up, you'll just be missing out on 50-75W of power from Pin 3. That will put your performance inline with a XC3.
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Regeren
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Re: Power connector setup for 3080Ti FTW
2021/07/27 17:26:30
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It's an Apevia ATX-CB700W. The tech support person, (not an expert) said the 2, 4 pin molex connectors to 1 8pin PCIE adapter would be alright. I was just wondering about the 4, 4 pin Molex the power supply came with on one cable. Wouldn't it be able to hold at least 60 or so watts per 4 pin molex so 120 watts total on the one cable? And how does the card draw power? First through the PCIE slot on mainboard 75 watts, then 150 watts each on 8 pin PCIE, and only lastly through the third 3080Ti 8 pin PCIE connector? Or does it try to draw power equally through the 3 8 pin PCIE connectors? Thanks! KingEngineRevUp
It would be easier if you just shared your PSU maker.
And it will power up, you'll just be missing out on 50-75W of power from Pin 3. That will put your performance inline with a XC3.
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jaredbyoung
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Re: Power connector setup for 3080Ti FTW
2021/07/27 17:37:17
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I would honestly recommend you get a new PSU. You're under the recommended wattage for a FTW3 Ultra 3080 Ti as it is. I don't know anything about that brand but I did a quick search and it didn't sound good.
You need a minimum of 750W according to the EVGA recommendation and they aren't trying to scare people away by telling them they need a big PSU, but it's typically a very good idea to overshoot the min spec for your PSU IMHO.
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Regeren
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Re: Power connector setup for 3080Ti FTW
2021/07/27 17:49:51
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Only thing is, I need the graphics upgrade for work now, and I am going to upgrade the power supply when doing the computer upgrade...Which won't be till Q4 late this year because I am getting an Alder Lake CPU on a LG1700 chipset most likely, small chance AMD AM5 next chipset Ryzen 6000 series which is either Q4 or Q1 022. So I have to get this video card working with under voltage till then. Should be able to limit it to 325 watts I am pretty sure no jaredbyoung
I would honestly recommend you get a new PSU. You're under the recommended wattage for a FTW3 Ultra 3080 Ti as it is. I don't know anything about that brand but I did a quick search and it didn't sound good.
You need a minimum of 750W according to the EVGA recommendation and they aren't trying to scare people away by telling them they need a big PSU, but it's typically a very good idea to overshoot the min spec for your PSU IMHO.
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jaredbyoung
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Re: Power connector setup for 3080Ti FTW
2021/07/27 17:56:19
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☄ Helpfulby Regeren 2021/07/27 18:42:55
Regeren
Only thing is, I need the graphics upgrade for work now, and I am going to upgrade the power supply when doing the computer upgrade...Which won't be till Q4 late this year because I am getting an Alder Lake CPU on a LG1700 chipset most likely, small chance AMD AM5 next chipset Ryzen 6000 series which is either Q4 or Q1 022. So I have to get this video card working with under voltage till then. Should be able to limit it to 325 watts I am pretty sure no
jaredbyoung
I would honestly recommend you get a new PSU. You're under the recommended wattage for a FTW3 Ultra 3080 Ti as it is. I don't know anything about that brand but I did a quick search and it didn't sound good.
You need a minimum of 750W according to the EVGA recommendation and they aren't trying to scare people away by telling them they need a big PSU, but it's typically a very good idea to overshoot the min spec for your PSU IMHO.
Yeah, if you're gonna undervolt it that PSU will probably be just fine. If that's what you're gonna do and it will run on 2 PCIe connectors as KineEngineRevUp said (I don't actually know if that's true) then I'd do that and skip doing anything wonkey with molex to PCIe adapters.
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talon951
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Re: Power connector setup for 3080Ti FTW
2021/07/27 18:14:13
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☄ Helpfulby Regeren 2021/07/27 18:42:43
Yea I wouldn't want to risk a $1400 video card myself. The 3rd 8pin does only draw 70w or a little more at full power. According to what Google just told me, a molex connection is good for 54w. So 2 would theoretically work.
BTW, in case you don't know, the 3rd connector is the one furthest toward the back of the case (on the left with the card plugged in to the motherboard) .
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Regeren
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Re: Power connector setup for 3080Ti FTW
2021/07/27 18:41:30
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jaredbyoung
Regeren
Only thing is, I need the graphics upgrade for work now, and I am going to upgrade the power supply when doing the computer upgrade...Which won't be till Q4 late this year because I am getting an Alder Lake CPU on a LG1700 chipset most likely, small chance AMD AM5 next chipset Ryzen 6000 series which is either Q4 or Q1 022. So I have to get this video card working with under voltage till then. Should be able to limit it to 325 watts I am pretty sure no
jaredbyoung
I would honestly recommend you get a new PSU. You're under the recommended wattage for a FTW3 Ultra 3080 Ti as it is. I don't know anything about that brand but I did a quick search and it didn't sound good.
You need a minimum of 750W according to the EVGA recommendation and they aren't trying to scare people away by telling them they need a big PSU, but it's typically a very good idea to overshoot the min spec for your PSU IMHO.
Yeah, if you're gonna undervolt it that PSU will probably be just fine. If that's what you're gonna do and it will run on 2 PCIe connectors as KineEngineRevUp said (I don't actually know if that's true) then I'd do that and skip doing anything wonkey with molex to PCIe adapters.
I'll have to search, but the 3080Ti will power up with only two of the 8 pin PCIE connectors connected? Also, I don't need any ultra high performance, as long as I can get about 50% capability or near 2070 levels it'll be fine.
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kevinc313
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Re: Power connector setup for 3080Ti FTW
2021/07/27 18:57:24
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☄ Helpfulby Regeren 2021/07/27 19:46:47
This is the most legit way to power that 3rd 8-pin, which is known to typically max out at 75w card draw: https://www.amazon.com/StarTech-com-Express-Power-Adapter-Cable/dp/B001TK3TJY That takes one of your available 6-pin PCIe connectors on that PSU and brings it out to 8-pin PCIe. Startech is a reputable brand, you get good wire and contacts. The 6-pin is rated for 216w, so you should be well under that. Should be totally safe from a wiring setup standpoint, and preferabe to using a Y-adapter on a 8-pin or the molex. If you have the 2 molex adapter in hand already, it should be OK too, just not as sano. https://www.gpuminingresources.com/p/psu-cables.html That said, be very careful with how much power you run on that 3080 Ti, don't just undervolt, reduce the Power Limit setting to like 75% (300w). You can try full power but expect to put the PSU or GPU into protect mode. My 3080 Ti FTW3 put a 1300w Seasonic Prime into protect shut down twice when running at full power high load, due to what I assume are crazy transients. Clean out the PSU air filter and any other dust, then keep an eye/ear/hand (temps) on it.
post edited by kevinc313 - 2021/07/27 19:03:45
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Regeren
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Re: Power connector setup for 3080Ti FTW
2021/07/27 19:51:29
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kevinc313
This is the most legit way to power that 3rd 8-pin, which is known to typically max out at 75w card draw:
That takes one of your available 6-pin PCIe connectors on that PSU and brings it out to 8-pin PCIe. Startech is a reputable brand, you get good wire and contacts. The 6-pin is rated for 216w, so you should be well under that. Should be totally safe from a wiring setup standpoint, and preferabe to using a Y-adapter on a 8-pin or the molex. If you have the 2 molex adapter in hand already, it should be OK too, just not as sano.
That said, be very careful with how much power you run on that 3080 Ti, don't just undervolt, reduce the Power Limit setting to like 75% (300w). You can try full power but expect to put the PSU or GPU into protect mode. My 3080 Ti FTW3 put a 1300w Seasonic Prime into protect shut down twice when running at full power high load, due to what I assume are crazy transients. Clean out the PSU air filter and any other dust, then keep an eye/ear/hand (temps) on it.
Thanks, sounds like good advice. I have 2 6+2 pin PCIE cables with connectors=150wattsx2=300 watts I believe is the rating right? And then the mainboard 75 watts. So the 3rd cable I thought would be fine with the 2 molex=about 100 watts max? Because the PSU does not have any more separate 6 pin PCIE cables, only two SATA cables besides ATX power cables 24 and 4 pin. The power limit settings are in the EVGA software or something like MSI Afterburner? And will a lower power limit setting like 75% etc. protect against power spikes? I was going to buy a 850 watt PSU when I do the PC upgrade Q4, are you saying even with a 1300 watt PSU power spikes will still happen and cause shutdowns even with power limited in software?
post edited by Regeren - 2021/07/27 19:55:14
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talon951
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Re: Power connector setup for 3080Ti FTW
2021/07/27 19:59:37
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Yea but Seasonics have had that problem on some models, at least in the past. I have a RM850x and have even hit it with 500w+ with the Galax 1000w bios on the card. Never has hit OCP.
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ty_ger07
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Re: Power connector setup for 3080Ti FTW
2021/07/27 20:07:47
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KingEngineRevUp
And it will power up, you'll just be missing out on 50-75W of power from Pin 3.
Are you sure? I don't think that it will. Without any power going to one connector, the card will think that there is no load on that input, and will therefore power balance all the load to that connector to try to balance it out, and thus the card will not power up at all. But with EVGA's power balance being so whack, maybe you are right about this, and it will still power on. Do you know from experience? Have you tested? I know that other cards will simply not power on at all due to the power balance thing. If this EVGA card powers on the way you say, I would say it is due to a design flaw and is not typical. Without it connected, the card can (if EVGA took the time to design the card properly) detect that one connector is missing and would give this error message:  Forcing the card to believe that there is a cable connected via a dummy plug (in the video linked above) would also not work due to the power balancing thing mentioned. You need all three to be connected. You can hack anything into existence with baling wire and duct tape, but whatever you do, I am pretty confident that all three need to be connected by some means. (please connect it by proper means)
post edited by ty_ger07 - 2021/07/27 21:48:12
ASRock Z77 • Intel Core i7 3770K • EVGA GTX 1080 • Samsung 850 Pro • Seasonic PRIME 600W Titanium
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kevinc313
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Re: Power connector setup for 3080Ti FTW
2021/07/27 21:25:33
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Regeren
kevinc313
This is the most legit way to power that 3rd 8-pin, which is known to typically max out at 75w card draw:
That takes one of your available 6-pin PCIe connectors on that PSU and brings it out to 8-pin PCIe. Startech is a reputable brand, you get good wire and contacts. The 6-pin is rated for 216w, so you should be well under that. Should be totally safe from a wiring setup standpoint, and preferabe to using a Y-adapter on a 8-pin or the molex. If you have the 2 molex adapter in hand already, it should be OK too, just not as sano.
That said, be very careful with how much power you run on that 3080 Ti, don't just undervolt, reduce the Power Limit setting to like 75% (300w). You can try full power but expect to put the PSU or GPU into protect mode. My 3080 Ti FTW3 put a 1300w Seasonic Prime into protect shut down twice when running at full power high load, due to what I assume are crazy transients. Clean out the PSU air filter and any other dust, then keep an eye/ear/hand (temps) on it.
Thanks, sounds like good advice.
I have 2 6+2 pin PCIE cables with connectors=150wattsx2=300 watts I believe is the rating right? And then the mainboard 75 watts. So the 3rd cable I thought would be fine with the 2 molex=about 100 watts max? Because the PSU does not have any more separate 6 pin PCIE cables, only two SATA cables besides ATX power cables 24 and 4 pin.
The power limit settings are in the EVGA software or something like MSI Afterburner? And will a lower power limit setting like 75% etc. protect against power spikes?
I was going to buy a 850 watt PSU when I do the PC upgrade Q4, are you saying even with a 1300 watt PSU power spikes will still happen and cause shutdowns even with power limited in software?
Yeah the dual (or even a single molex) should be fine, see the guide I linked. But I did look up your power supply part number and it shows as having dual 6-pin PCIe's in addition to the 8-pins, so maybe you should double check it, they may be tucked away somewhere. You sound like you've done your homework, so that's good. X1 and AB can be used to adjust power limit. X1 is preferred because it provides firmware updates, RGB control (can turn it off lol) and 3rd fan control. People like Afterburner because it's easier to undervolt. Don't conflate undervolting with setting a lower power limit, they result in different things. Even good PSU's can have overly sensitive protection circuits, like my Seasonic. It was the PSU putting itself into protect due a HARD load at 450w PL and high overclock both times, was not the card going into protect due to a poor PSU. Not sure which is worse. People are recently reporting good luck with the Corsair RM850x, reasonable price. I put in a Super Flower Leadex SE 1000w Platinum, it's been fine at max power and OC so far, but limited testing. The EVGA G2, G3, P3, T2 are good too but I'd go 1000w or more on them.
post edited by kevinc313 - 2021/07/27 21:27:19
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KingEngineRevUp
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Re: Power connector setup for 3080Ti FTW
2021/07/27 22:59:10
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ty_ger07
KingEngineRevUp
And it will power up, you'll just be missing out on 50-75W of power from Pin 3.
Are you sure? I don't think that it will. Without any power going to one connector, the card will think that there is no load on that input, and will therefore power balance all the load to that connector to try to balance it out, and thus the card will not power up at all. But with EVGA's power balance being so whack, maybe you are right about this, and it will still power on. Do you know from experience? Have you tested? I know that other cards will simply not power on at all due to the power balance thing. If this EVGA card powers on the way you say, I would say it is due to a design flaw and is not typical.
Without it connected, the card can (if EVGA took the time to design the card properly) detect that one connector is missing and would give this error message:
Forcing the card to believe that there is a cable connected via a dummy plug (in the video linked above) would also not work due to the power balancing thing mentioned.
You need all three to be connected. You can hack anything into existence with baling wire and duct tape, but whatever you do, I am pretty confident that all three need to be connected by some means. (please connect it by proper means)
You are absolutely correct
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Regeren
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Re: Power connector setup for 3080Ti FTW
2021/07/29 18:48:11
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talon951
Yea I wouldn't want to risk a $1400 video card myself. The 3rd 8pin does only draw 70w or a little more at full power. According to what Google just told me, a molex connection is good for 54w. So 2 would theoretically work.
BTW, in case you don't know, the 3rd connector is the one furthest toward the back of the case (on the left with the card plugged in to the motherboard) .
Hey, so you guys are sure the 3rd 8 pin draws about 70 watts? And the 3rd connector is the one nearest the back/rear of the case and on the hold-down brackett side of the card and case right?
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kevinc313
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Re: Power connector setup for 3080Ti FTW
2021/07/29 19:45:45
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Regeren
talon951
Yea I wouldn't want to risk a $1400 video card myself. The 3rd 8pin does only draw 70w or a little more at full power. According to what Google just told me, a molex connection is good for 54w. So 2 would theoretically work.
BTW, in case you don't know, the 3rd connector is the one furthest toward the back of the case (on the left with the card plugged in to the motherboard) .
Hey, so you guys are sure the 3rd 8 pin draws about 70 watts?
And the 3rd connector is the one nearest the back/rear of the case and on the hold-down brackett side of the card and case right?
I was under the impression #1 was the closest to the back of the case, and #3 was at the front, but if anyone would like to confirm that for sure......... Edit: I was wrong, see below.
post edited by kevinc313 - 2021/07/29 20:59:16
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Regeren
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Re: Power connector setup for 3080Ti FTW
2021/07/29 20:19:26
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kevinc313
Regeren
talon951
Yea I wouldn't want to risk a $1400 video card myself. The 3rd 8pin does only draw 70w or a little more at full power. According to what Google just told me, a molex connection is good for 54w. So 2 would theoretically work.
BTW, in case you don't know, the 3rd connector is the one furthest toward the back of the case (on the left with the card plugged in to the motherboard) .
Hey, so you guys are sure the 3rd 8 pin draws about 70 watts?
And the 3rd connector is the one nearest the back/rear of the case and on the hold-down brackett side of the card and case right?
I was under the impression #1 was the closest to the back of the case, and #3 was at the front, but if anyone would like to confirm that for sure.........
Forgot to mention, the 2 main PCIE cables on this PSU are split to 2 connectors, one 6 pin PCIE daisy chain drop off the same cable with the 6+2 pin, could one of these 6 pin PCIE connectors go to an 8 pin PCIE adapter to the 3rd connector, and it would be the second 8 pin PCIE off the same cable, wouldn't that =up to 300 watts on that cable potentially? Is that how that PSU cable is designed to work and could run 300 watts on it?
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kevinc313
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Re: Power connector setup for 3080Ti FTW
2021/07/29 20:29:06
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Regeren
kevinc313
Regeren
talon951
Yea I wouldn't want to risk a $1400 video card myself. The 3rd 8pin does only draw 70w or a little more at full power. According to what Google just told me, a molex connection is good for 54w. So 2 would theoretically work.
BTW, in case you don't know, the 3rd connector is the one furthest toward the back of the case (on the left with the card plugged in to the motherboard) .
Hey, so you guys are sure the 3rd 8 pin draws about 70 watts?
And the 3rd connector is the one nearest the back/rear of the case and on the hold-down brackett side of the card and case right?
I was under the impression #1 was the closest to the back of the case, and #3 was at the front, but if anyone would like to confirm that for sure.........
Forgot to mention, the 2 main PCIE cables on this PSU are split to 2 connectors, one 6 pin PCIE daisy chain drop off the same cable with the 6+2 pin, could one of these 6 pin PCIE connectors go to an 8 pin PCIE adapter to the 3rd connector, and it would be the second 8 pin PCIE off the same cable, wouldn't that =up to 300 watts on that cable potentially? Is that how that PSU cable is designed to work and could run 300 watts on it?
Yeah, with the adapter I linked above. Those are your missing 6-pins, was not clear on the pic I saw. The 6-pin+adapter should be fine on #3. Or not. https://www.reddit.com/r/..._on_a_3080_ftw3_ultra/ Since we are now talking about daisy chain, you would want to combine #1 and #3, as the #2 draws a ton of power.
post edited by kevinc313 - 2021/07/29 20:40:18
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kevinc313
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Re: Power connector setup for 3080Ti FTW
2021/07/29 20:58:18
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BTW, Talon951 was the one who did the amp clamp measurements on overclock.net, so he is an authoritative source that the #3 plug is closest the rear of the PC. Sorry for any confusion.
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Regeren
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Re: Power connector setup for 3080Ti FTW
2021/07/29 21:45:01
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kevinc313
Regeren
kevinc313
Regeren
talon951
Yea I wouldn't want to risk a $1400 video card myself. The 3rd 8pin does only draw 70w or a little more at full power. According to what Google just told me, a molex connection is good for 54w. So 2 would theoretically work.
BTW, in case you don't know, the 3rd connector is the one furthest toward the back of the case (on the left with the card plugged in to the motherboard) .
Hey, so you guys are sure the 3rd 8 pin draws about 70 watts?
And the 3rd connector is the one nearest the back/rear of the case and on the hold-down brackett side of the card and case right?
I was under the impression #1 was the closest to the back of the case, and #3 was at the front, but if anyone would like to confirm that for sure.........
Forgot to mention, the 2 main PCIE cables on this PSU are split to 2 connectors, one 6 pin PCIE daisy chain drop off the same cable with the 6+2 pin, could one of these 6 pin PCIE connectors go to an 8 pin PCIE adapter to the 3rd connector, and it would be the second 8 pin PCIE off the same cable, wouldn't that =up to 300 watts on that cable potentially? Is that how that PSU cable is designed to work and could run 300 watts on it?
Yeah, with the adapter I linked above. Those are your missing 6-pins, was not clear on the pic I saw. The 6-pin+adapter should be fine on #3.
Okay but then that would be 2 PCIE connectors off the same cable, so 300 watts 0n one cable, that okay? If the card draws max power on each connector? I am going to power limit the card to like 280 watts so even if it distributes power draw evenly from 3 connectors it would be 65 watts per connector that I think.
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kevinc313
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Re: Power connector setup for 3080Ti FTW
2021/07/30 05:30:33
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Regeren
kevinc313
Regeren
kevinc313
Regeren
talon951
Yea I wouldn't want to risk a $1400 video card myself. The 3rd 8pin does only draw 70w or a little more at full power. According to what Google just told me, a molex connection is good for 54w. So 2 would theoretically work.
BTW, in case you don't know, the 3rd connector is the one furthest toward the back of the case (on the left with the card plugged in to the motherboard) .
Hey, so you guys are sure the 3rd 8 pin draws about 70 watts?
And the 3rd connector is the one nearest the back/rear of the case and on the hold-down brackett side of the card and case right?
I was under the impression #1 was the closest to the back of the case, and #3 was at the front, but if anyone would like to confirm that for sure.........
Forgot to mention, the 2 main PCIE cables on this PSU are split to 2 connectors, one 6 pin PCIE daisy chain drop off the same cable with the 6+2 pin, could one of these 6 pin PCIE connectors go to an 8 pin PCIE adapter to the 3rd connector, and it would be the second 8 pin PCIE off the same cable, wouldn't that =up to 300 watts on that cable potentially? Is that how that PSU cable is designed to work and could run 300 watts on it?
Yeah, with the adapter I linked above. Those are your missing 6-pins, was not clear on the pic I saw. The 6-pin+adapter should be fine on #3.
Okay but then that would be 2 PCIE connectors off the same cable, so 300 watts 0n one cable, that okay? If the card draws max power on each connector?
I am going to power limit the card to like 280 watts so even if it distributes power draw evenly from 3 connectors it would be 65 watts per connector that I think.
Card will never draw 300w on #1 and #3 combined, which is why you want to daisy chain those two. Max recommended on one cable is 288w, but that's maingl limited by the PSU side connector on a modular PSU. Since your cables are hardwired you might have a bit more leeway. https://www.overclock.net/threads/official-nvidia-rtx-3080-ti-owners-club.1791823/page-12#post-28835729 So about 230w total for #1 and #2 at a 450w. Should be fine, until it's not.
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