Gigabyte z87X-OC doesn't work with 4 ATI 5970

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Adrian Gut

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Jan 12, 2014
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Hi,

Trying to get 4 x ATI 5970 to work on a brand new Gigabyte z87X-OC.
I can get 3 of them to be recognized in Windows (6 GPUs), but when I plug in the 4th card, sometimes it won't boot - after a couple of tries it will get in Windows but I can still see only 6 GPUs.

I can use any 3 of the 4 PCIe 16x slots, it will work; when I use all 4 of them I get trouble.
It's not a power supply issue - I have a Cooler Master 1500W.

I will reward in BTC anyone that solves this issue.
 
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Hunterr

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Dec 29, 2013
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Hey there. I have read alot of information on the ATI 5970 . Do you know that 1 ATI 5970 = 2 GRaphics cards? so the max you can put in is 2 5970's which is equal to 4 graphics cards. That is the maximum. Plus make sure you have good cooling in your system.
 
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Adrian Gut

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Jan 12, 2014
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Hey Hunterr, thanks for the swift reply!
I know that 1 ATI 5970 card has 2 GPUs onboard, but you are wrong about the max being 2 in one machine; Win7 64 bit allows for max 8 GPUs or in this case 4 5970 cards.
I have successfully installed 3 cards (Win7 sees all 6 GPUs) but the moment I plugin the 4th card, things either go wrong (machine won't boot, etc.) or Win7 sees the same 6 GPUs as before.

I've seen just a few configurations with details on internet with 4 x 5970, I really don't know what the problem might be and I'm out of ideas on how to debug this.
 
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Adrian Gut

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Jan 12, 2014
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I just bought yesterday a Gigabyte GA-Z87X-OC.
It's not the heat because once I remove the 4th card everything's fine. I have proper cooling, everything's fine on that.

The motherboard has 4 PCIe 16x but only 3 of those are on the CPU, the 4th is on the MB's chipset.
I've played with Bios settings - setting all pcie on Gen1/2/3 in turn, but no luck.
 
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Hunterr

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Dec 29, 2013
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Well ive read around this forum that people with 2 5970's use like a 1200W power supply , maybe you would need way more but i have no idea what power supply you need considering there are 8 GPUS there. it is kind of overkill you know? there wont be much difference why not play with 2 5970's? Are your graphics cards watercooled?
 
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Adrian Gut

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Jan 12, 2014
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At full load, a 5970 (the whole card, includes both GPUs) draws 294W. All 4 cards would draw 1200W which leaves ~300W for the system - that's more than enough even if subtracting the efficiency margin.
But the cards are not at full load, they are almost idle, so the power is not even a factor here.

At this stage I simply want to get all GPUs to show in Win7; when mining, if the power is not enough at full load - that's another business :)

The cards are not watercooled. I've successfully ran 3 cards, with all 6 GPUs mining.
But again, can't plug-in the 4th card and get Win7 to recognize the additional 2 GPUs.
 
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Adrian Gut

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Jan 12, 2014
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Can anyone maybe suggest a MB that fully supports 4 x 5970? I would appreciate somebody that has/had this configuration and knows from experience that it works. Thanks!
 
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Adrian Gut

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Jan 12, 2014
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Update: I couldn't get the Gigabyte Z87X-OC to work with 4 x 5970, so I returned it.
However, user Johnno29 suggested the Gigabyte G1-Sniper 3 and today I've managed to get all 4 x 5970 working on this board; the CPU used was G2030.
 
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