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Dual PCIe 6+2 for SLI Advice/Help needed

post #1 of 12
Thread Starter 
I will get straight to the point..

I have this cable..


My two GPU's (980TI's) have a 6 pin and an 8 pin slot each.

Can i use this one cable to connect my PSU (coolermaster v1200 platinum) to both my 8 pin slots?

If "Yes" will it have any stability issues?

Thanks
post #2 of 12
I'm hoping one of the PSU experts chimes in but this is the logic I'm using....

Because your PSU has a single +12V rail it shouldn't matter if your graphics cards are all powered by a single cable or two separate ones.

If your PSU had multiple rails then you would achieve better stability using two different cables that connected to different rails.
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post #3 of 12
Thread Starter 
Quote:
Originally Posted by BinaryDemon View Post

I'm hoping one of the PSU experts chimes in but this is the logic I'm using....

Because your PSU has a single +12V rail it shouldn't matter if your graphics cards are all powered by a single cable or two separate ones.

If your PSU had multiple rails then you would achieve better stability using two different cables that connected to different rails.

is my PSU bad because it has single rail? (Im new to this) would multiple rails be better?
post #4 of 12
Quote:
Originally Posted by Arsenal FC View Post

is my PSU bad because it has single rail? (Im new to this) would multiple rails be better?

Not bad, just different. I think multiple rails provides slightly more protection since one of the rails could short and not damage everything in the system, but single rail is easiest to setup since you don't have to plan which devices will be on which rail.
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post #5 of 12
Quote:
Originally Posted by Arsenal FC View Post

I will get straight to the point..

I have this cable..


My two GPU's (980TI's) have a 6 pin and an 8 pin slot each.

Can i use this one cable to connect my PSU (coolermaster v1200 platinum) to both my 8 pin slots?

If "Yes" will it have any stability issues?

Thanks

Yes it will work but many like myself prefer to use two separate cables. Just to simply to spread out the draw.
post #6 of 12
Thread Starter 
Quote:
Originally Posted by chronicfx View Post

Yes it will work but many like myself prefer to use two separate cables. Just to simply to spread out the draw.

Okay thanks, Now to find a dual 6 pin
post #7 of 12
Yes, you can, but I wouldn't.
Quote:
Originally Posted by BinaryDemon View Post

Because your PSU has a single +12V rail it shouldn't matter if your graphics cards are all powered by a single cable or two separate ones.

The issue with using a single PSU output for a high-end GPU isn't limited to OCP or rail separation.

That cable has three +12v conductors, and a 980ti at peak load can pull very near the maximum current these wires can safely handle and if anything is wrong with the connectors or cable, you could melt them or start a fire.

250+w out of three pins is just not a good idea.
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post #8 of 12
Quote:
Originally Posted by Blameless View Post

Yes, you can, but I wouldn't.
The issue with using a single PSU output for a high-end GPU isn't limited to OCP or rail separation.

That cable has three +12v conductors, and a 980ti at peak load can pull very near the maximum current these wires can safely handle and if anything is wrong with the connectors or cable, you could melt them or start a fire.

250+w out of three pins is just not a good idea.

See I actually thought about that but I figured that this isnt a 3rd party cable, it was provided by the PSU manufacturer. I was certain they would design the cable with thick enough gauge to handle the maximum amperage that two GPU's could draw. Apparently I gave CoolerMaster too much credit.
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post #9 of 12
Thread Starter 
Quote:
Originally Posted by BinaryDemon View Post

See I actually thought about that but I figured that this isnt a 3rd party cable, it was provided by the PSU manufacturer. I was certain they would design the cable with thick enough gauge to handle the maximum amperage that two GPU's could draw. Apparently I gave CoolerMaster too much credit.

The reason to my thinking about using the cable was because it came in the box, what other situation would you use a dual 6+2 pcie? I also had my fears the cable wouldnt handel it and thats why i came to the forum...

Using a seperate 8 pin on each and a seperate 6 pin on each would be the best and safest way is the message im getting from this forum
post #10 of 12
Quote:
Originally Posted by Arsenal FC View Post

The reason to my thinking about using the cable was because it came in the box, what other situation would you use a dual 6+2 pcie? I also had my fears the cable wouldnt handel it and thats why i came to the forum...

Using a seperate 8 pin on each and a seperate 6 pin on each would be the best and safest way is the message im getting from this forum

myself I always use separate power cables, I never use the 1 cable with 2 ends.
Thats just me though. biggrin.gif
Also from my experience and what I have researched a single 12v rail psu is better than a multi 12v rail psu. single rail is also more common.

here is a thread on OCN explaining single and multi rail psu.
http://www.overclock.net/t/761202/single-rail-vs-multi-rail-explained
Edited by jlhawn - 10/9/16 at 8:16pm
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