8 pin to dual 8 pin (6+2)

[radu91]

I have evga 1000G. This PSU comes stock with 2 cables that work for 1080ti. I tdp around 70% on 1080ti already tested. They stay around 170Wx4 = ~680w plus the rest goes up to around 800w from the wall. This fits in the 80% push for the PSU which I think it's healthy.

I would have gone with evga 1600w PSU but they are ridiculously out of stock and didn't want to wait. As soon as the bigger psu comes in stock I am ordering it and I'll make another 4 or 5x 1070s rig with the 1000w PSU.

So you mean you have a couple of 8+8 pin cables?

I do have extra 8 + 8 pin cables. I do. Am I being terrible noobish right now? Is there a "trick" that is right in front of my eyes but just don't see it ? If I plug it in with a second 8 pin cable and use the 6 pin at the end, windows won't see the GPU. It's in device manager with the yellow warning sign. As soon as I put the right cable (8 pin to dual 8 pin (6+2)), it is recognized.

[1715460035]

1715460035

[bathrobehero]

I have evga 1000G. This PSU comes stock with 2 cables that work for 1080ti. I tdp around 70% on 1080ti already tested. They stay around 170Wx4 = ~680w plus the rest goes up to around 800w from the wall. This fits in the 80% push for the PSU which I think it's healthy.

I would have gone with evga 1600w PSU but they are ridiculously out of stock and didn't want to wait. As soon as the bigger psu comes in stock I am ordering it and I'll make another 4 or 5x 1070s rig with the 1000w PSU.

So you mean you have a couple of 8+8 pin cables?

I do have extra 8 + 8 pin cables. I do. Am I being terrible noobish right now? Is there a "trick" that is right in front of my eyes but just don't see it ? If I plug it in with a second 8 pin cable and use the 6 pin at the end, windows won't see the GPU. It's in device manager with the yellow warning sign. As soon as I put the right cable (8 pin to dual 8 pin (6+2)), it is recognized.

No, I'm just very surprised as all my cables are 8+6 (6+2 + 6) maximum and I've been buying big EVGA PSUs for years now. Even bought some extra cables from them directly but they didn't have 8+8, only 8+6.

[QuintLeo]

R9 295x2 is out of specs card with tdp of 500w and only 2x8-pin connectors, I have seen spikes of 600w at the wall when fully unleashed.

Based on my experiments with those and two normal 8-pin 200w cards chained I would say 250w/ 8-pin is easily doable but going beyond that point you really need to know what you are doing. But it is easy to test, just launch your miner and monitor connector/ cabling temps.

To be really sure you need custom male+female connectors at both ends and heavy wiring between them. In early 2016 when daily eth profits were at $5/20MH I used 20" fans just to cool my connectors...

 Officially, the R9 295x2 was a 450 watt TDP card
 (yeah, I know - I'm ROFLAMO too!)
 I am not at all amazed pull up to 600, as that's in line with it being a dual R9 290x and THOSE were 300+ watt cards when pushed - I'd think the main limit on a 295x2 would be cooling, though I think most or all of them had at least some water cooling?


 8 + 8 would requite 12 AWG to run safely at max PCI-E spec - which would be a royal PITA on needing custom pins and connectors to fit into the PS itself as I'm pretty sure even 14 AWG is pushing the spec on the standard PCI-E sized connector pins.

 Also, 8 + 8 x 6 times (EVGA G2 1300) would be as high as 1500 watts JUST for the PCI-E connectors without exceeding PCI-E specs - and a very bad idea.
 8 + 6 on 6 cables would exceed the PS limit by a bit if they were all loaded down to the full PCI-E spec (150 + 75 = 225 watts a cable, 6 times would be 1350 watts).


 BTW - a pair of 8 + 6 and 4 more single 6+2 is *6* 8-pin-capable connectors on the stock EVGA G2 1300 cable set, not 5.
 Still not enough to run more than 4 of any GTX 1080ti model though.

[QuintLeo]

look for 16 awg 18 awg is dangerous imo

16 awg?  I doubt you will find that.  The wire in the wall on a 15amp circuit is 14 awg and that is rated to carry 1800 watts.  20amp circuit uses 12 wire.   18 gauge is definitely enough to carry 150 or so watts.

 No, 14 AWG wire is rated to carry 15 AMPS at up to whatever voltage limit the insulation is good for - this has NOTHING to do with watts.

 18 AWG at 12 VDC will NOT handle 150 watts comfortably, as that is 12.5 AMPS and 18 AWG is only rated for something like 7 or 8.

 Quite a few high-quality power supplies will use 16 AWG wiring on their PCI-E dual-connector cables because it's NEEDED to handle the load from both connectors safely - some use it on all of their PCI-E cables just to save the trouble of keeping more than one size around and having to worry about mixing them up.

[bathrobehero]

Contacted EVGA and they do not have 8+8 cables in any form (like 6+2 + 6+2).

Only 8+6.

So there's some misunderstanding here.

When we're talking about 8 or 6-pin cables we're talking about the usable end which you can plug into the cards. The 8-pin end you plug into the PSU doesn't matter.

[antantti]

I am not at all amazed pull up to 600, as that's in line with it being a dual R9 290x and THOSE were 300+ watt cards when pushed - I'd think the main limit on a 295x2 would be cooling, though I think most or all of them had at least some water cooling?

They were all reference cards with hybrid cooling thermal throttling starting at 75C, custom loop is a must if you want to really push them.

8 + 8 would requite 12 AWG to run safely at max PCI-E spec - which would be a royal PITA on needing custom pins and connectors to fit into the PS itself as I'm pretty sure even 14 AWG is pushing the spec on the standard PCI-E sized connector pins.

One thing I have not tried yet is to try without those plastic connectors, just pins at the both ends. That would give some more space to heavy duty pins too.

Also I am sure I saw somewhere higher rated 8-pin connectors, there were at least three different ratings for different current levels. I just can't find that store anymore.

[dragon123]

The evga 1000gq comes with 4 8+8 pin cables and I'm currently running 4 1080tis. You can't use connectors from different psu as the pin layout is different for each manufacturer.

[bathrobehero]

The evga 1000gq comes with 4 8+8 pin cables and I'm currently running 4 1080tis. You can't use connectors from different psu as the pin layout is different for each manufacturer.

Hahh! Finally a picture I can actually really see 8+8 cables!

It seems the EVGA SuperNOVA models doesn't have 8+8 cables but other models do.

Weird, really.

I'm curious if the cables for the 1000GQ are interchangeable with the SuperNOVA models. It would be silly if it wouldn't but who knows, time to ask EVGA again.

[dragon123]

Sadly they are not interchangeable, the GQ series seems like the odd one out as you can't even buy the cables from the evga site.
As for OP, what you can do is swap the psu end of an 8+8 cable with the psu end of one of your evga single 8 pin cables. You have to make sure the wires are aligned exactly as your other evga pcie cables. There's a youtube video of how to remove pins off a psu cable using staples if you want to give it a go.

[Vaccinus]

just buy more cables from the same vendors for example corsair sell additional pie cables for cheap, because no pay come with more than 4x 2x6+2 10x pie cables

[QuintLeo]

No, 1080 Ti's require 2 x 8 pins and the G2 1300W comes with 6 VGA ports on the PSU and 2 x 6+2 + 6 cables and 4 x 6+2 cables

That's 5 x 8 pins total (they might as well come with only 8 pin single cables) without converters meaning it can only handle exactly 3 pieces of 1080 Ti's.

I have 36x 1080 Ti's (4 different models) and 30 of them (3 different models) are using 8+6 pins. Only one of the four models use 8+8 pins.

Huh, didn't know that but I can see the FE also has 8+6.

 FE is 250 watt TDP.

 Aftermarket - I'd expect quite a few in the 300 watt range, with occasional high-end cards likely pushing 350 ballpark.

[QuintLeo]

Sadly they are not interchangeable, the GQ series seems like the odd one out as you can't even buy the cables from the evga site.
As for OP, what you can do is swap the psu end of an 8+8 cable with the psu end of one of your evga single 8 pin cables. You have to make sure the wires are aligned exactly as your other evga pcie cables. There's a youtube video of how to remove pins off a psu cable using staples if you want to give it a go.

  The G2 series is manufactured by Super Flower.
 *IF* I am remembering correctly, the GQ series is manufactured by Seasonic.

[KaydenC]

The splitter cables are fine and way cheaper than getting more cables from manufacturers. I use them for my 1080ti FE farm. Even when at 120% TDP, they never feel warm.
I'm sourcing several items (risers, mobos, this pcie splitter etc) from factories and selling them in an online shop soon.

[allcryptominer]

The splitter cables are fine and way cheaper than getting more cables from manufacturers. I use them for my 1080ti FE farm. Even when at 120% TDP, they never feel warm.
I'm sourcing several items (risers, mobos, this pcie splitter etc) from factories and selling them in an online shop soon.

I just ordered these cables https://www.aliexpress.com/item/1PCS-High-Quality-8-Pin-Male-to-Dual-8-Pin-6pin-2pin-MalePower-Cable-for-Video/32781960558.html?spm=2114.13010608.0.0.xQWXdg

It's 8 pin to dual 8 pin cables 18AWG. But according to people in this thread its a bad idea to run a 1080ti with just one of those splitter cables?

I just going to try and see what happends, hopefully it dosen't get to hot.

[KaydenC]

The splitter cables are fine and way cheaper than getting more cables from manufacturers. I use them for my 1080ti FE farm. Even when at 120% TDP, they never feel warm.
I'm sourcing several items (risers, mobos, this pcie splitter etc) from factories and selling them in an online shop soon.

I just ordered these cables https://www.aliexpress.com/item/1PCS-High-Quality-8-Pin-Male-to-Dual-8-Pin-6pin-2pin-MalePower-Cable-for-Video/32781960558.html?spm=2114.13010608.0.0.xQWXdg

It's 8 pin to dual 8 pin cables 18AWG. But according to people in this thread its a bad idea to run a 1080ti with just one of those splitter cables?

I just going to try and see what happends, hopefully it dosen't get to hot.

They are totally fine, even an overclocked 1080ti won't heat up the splitter cable, much less an underclocked one. I am using such cables (though not your model) for a few weeks now.

[QuintLeo]

The splitter cables are fine and way cheaper than getting more cables from manufacturers. I use them for my 1080ti FE farm. Even when at 120% TDP, they never feel warm.
I'm sourcing several items (risers, mobos, this pcie splitter etc) from factories and selling them in an online shop soon.

I just ordered these cables https://www.aliexpress.com/item/1PCS-High-Quality-8-Pin-Male-to-Dual-8-Pin-6pin-2pin-MalePower-Cable-for-Video/32781960558.html?spm=2114.13010608.0.0.xQWXdg

It's 8 pin to dual 8 pin cables 18AWG. But according to people in this thread its a bad idea to run a 1080ti with just one of those splitter cables?

I just going to try and see what happends, hopefully it dosen't get to hot.

They are totally fine, even an overclocked 1080ti won't heat up the splitter cable, much less an underclocked one. I am using such cables (though not your model) for a few weeks now.

 Your splitter cables appear to be at least 16 AWG though.

[grape_tectonics]

It's 8 pin to dual 8 pin cables 18AWG.

Be careful with whatever AWG claimed on aliexpress, I've gotten quite a few 2xmolex->8pin adapters from there that according to the seller are 20AWG but upon measuring myself turned out to be 24AWG.