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Old 2014-07-12, 21:05   #1
TheMawn's Avatar
May 2013
East. Always East.

11·157 Posts
Default 5+ GPU support

Hi, folks.

I've been reading about hardware lately and the things people are saying seem to be conflicting, so I've come here to see if anyone can help clear up my confusion.

Whenever someone asks about support for more than four GPU's, 95% people say it isn't possible right away because they assume that everybody running multiple GPU's is running SLI or CrossFireX.

Some of the BitCoin miners or people running Folding@Home were seen using three GTX 295's which makes six GPU's total, so once the gamers stopped trying to hijack the compute discussions, the consensus was that it was at least possible for NVidia cards, but a lot of people were maintaining that Windows cannot support more than four AMD GPU's.

I have also read that Windows cannot run more than 8 GPU's period, and in a situation where someone is running 4 dual-card GPU's, for example, the onboard graphics, if any, must be disabled (because that would make nine).

Can anyone substantiate any of these claims?

Last fiddled with by TheMawn on 2014-07-12 at 21:07
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Old 2014-07-13, 02:12   #2
Mark Rose
Mark Rose's Avatar
Jan 2013

3×977 Posts

This thread has a lot of insight:
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Old 2014-07-13, 02:29   #3
nucleon's Avatar
Mar 2003

5·103 Posts

I currently have

PC name: G7
2x 7990s (dual gpu card)

PC name: G3
2x 7990s (dual gpu card)

PC name: G6
1x GTX 580

PC name: MC
1x GTX 580

PC name: G4
1x Titan Black
1x GT750 TI

Total: 12 GPUs.

Across 5x PCs.

I have 2x 7990s in one machine (total=4GPUs) but heat is a real problem. I can't imagine 3x 7990s in the one machine without some creative clocking/exotic cooling/psu. Even if the OS can handle that much.

As it is G7 is cooled by a 50cm fan, and still the GPUs are running 80degC+

Aside from theoretical knowledge, there are a few hardware obstacles before you get to 5+ GPUs..

-- Craig
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Old 2014-07-13, 02:31   #4
kracker's Avatar
"Mr. Meeseeks"
Jan 2012
California, USA

32·241 Posts

Try "6 gpu mining rig"
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