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Hi,

I am looking for a mainboard that can run 5 GPU's on Win 7. Unfortunately I have to stick with Win 7 (Afterburner) because undervolting with VBE does not work with my cards (https://bitcointalk.org/index.php?topic=439521.msg4829290#msg4829290). Is any of you running such a board on Win 7, preferably with am3+ socket?

http://www.newegg.com/Product/Product.aspx?Item=N82E16813157262

$99

You'll need pci-e raisers(1x > 16x) to be able to fit all 5 GPU's however, I would recommend that you should just split the cards between two systems you're asking for trouble.

I have 10 cards and 3x Corsair 1000 W 80+ Gold. I want to run 5 on each mainboard. Are you sure 100% that ASRock 970 EXTREME4 will handle five cards? I have enough powered x1-Riser. That's not a problem.

I don't see why it wouldn't, I do not have it myself but it should do the trick.

I used the GA-990FXA-UD3 but it couldn't handle five cards. Only four worked and the fifth got Error Code 43. And I read that even the GA-990FXA-UD5 has problems with more than four cards, so I am confused.

http://www.newegg.com/Product/Product.aspx?Item=N82E16813128627

$83 shipped, and works with 5 GPUs.

@crazyates:

- Do you have this mainboard and using five cards?
- Which OS?
- How many risers are powered?

AMD Drivers only accept 4 cards on Windows 7 64. You must modify drivers to accept more than 4 cards...

AMD driver 12.6 does 5 GPU in Windows 7

Does 12.6 work with R9 280x's?

No.

But where can i find amd drivers 12.6  for HD 7950 ??

PS : Here : http://www.techpowerup.com/downloads/2153/amd-catalyst-12-6-software-suite-vista-7-64-bit/mirrors

Yes, we have multiple rigs using this board, all of which have 5 cards running. 5 280x and 5 290 rigs.

Ubuntu/Xubuntu 13.10. We've used the 13.12 and the 13.11beta drivers

All 5 are powered. We use the USB style risers for a few reasons:

1) They're powered. I'm not frying our motherboards, no matter how cheap.
2) They're powered with voltage regulation, so dual PSUs can be mix-and-match. One PSU can power the riser, when the other PSU powers the GPU.
3) The USB cables are longer than your standard riser.
4) The USB cables are more flexible than your standard riser. Combined with #3, allows for a lot more creativity and better airflow when mounting your GPUs.

@crazyates: Thanks for the infos. Do you have a link to the risers you bought and to the shop?

How do you modify the amd 13.12 drivers to support 5 cards?

https://bitcointalk.org/index.php?topic=257486.0

Or you can look here for 13.12 modded drivers :

https://litecointalk.org/index.php?topic=11761.0

Be careful with this board...the middle PCI-e 16x slot never works on them for me for some reason (Xubuntu). I only bought the board to run 4 GPU max anyway but I was really hoping to have the flexibility to expand to 5 if I chose in the future.

Regarding that motherboard, do you need to jump any of the slots or are all five GPUs recognized right out of the box? This looks like a great option, especially if I don't need to mess around with jumper cables because I'm not super comfortable doing that.