To those with multi-5970 setups: which mobo are you using? - page 3.

Raulo

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Quote from: dingus on February 11, 2011, 11:23:05 AM

Now look at this PSU: http://support.amd.com/us/certified/power-supplies/Pages/details.aspx?item=108
Only one supported.
So, I am confused because my PSU is not even on this list http://support.amd.com/us/certified/power-supplies/Pages/listing.aspx

I have a Corsair 850W and it works fine with two 5970s so 1000W should work, too. If each card works alone, it might be a BIOS issue.

dingus

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Quote from: Raulo on February 11, 2011, 08:04:42 AM

Quote from: dingus on February 11, 2011, 07:24:58 AM

It boots up I suppose. This is with 2x 5970s. Fans start up, I can tell the hard drive is working, everything seems normal except the "no video signal" from all 4 DVI ports.

Does each work separately in each PCIe slots?

Quote

Apparently I do not have a powerful enough PSU. I am pretty sure I need a 1200 watt instead of 1000 one. I'll update this thread when I get the chance to try a 1200 watt.

If it's not a crappy defective PSU, it should be more than enough. I run two 5970s on 850W PSU and there is still some headroom (the system draws 660W from the outlet which is less than 600W on the DC).

It is an 80 gold certified PSU. I am not sure what you mean if they work separately in each slots. I have tried one card at a time in each slot, to determine if I have a faulty card, but they both work that way; just not together, link cable or not. I am thinking it is a mobo bios issue.

edit: Alright. Take a look at this "certified crossfire PSU" which is 1000 watt. http://support.amd.com/us/certified/power-supplies/Pages/details.aspx?item=44

It can support 2 5970s.

Now look at this PSU: http://support.amd.com/us/certified/power-supplies/Pages/details.aspx?item=108

Only one supported.

So, I am confused because my PSU is not even on this list http://support.amd.com/us/certified/power-supplies/Pages/listing.aspx

fabianhjr

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Do The Evolution

The expensive way get one of those Quad-SLI/CrossFire Certified Mobos, an 11 backslots(rare) case and liquid cooling.

The economic way: http://blog.zorinaq.com/

Raulo

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Activity: 238

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Quote from: dingus on February 11, 2011, 07:24:58 AM

It boots up I suppose. This is with 2x 5970s. Fans start up, I can tell the hard drive is working, everything seems normal except the "no video signal" from all 4 DVI ports.

Does each work separately in each PCIe slots?

Quote

Apparently I do not have a powerful enough PSU. I am pretty sure I need a 1200 watt instead of 1000 one. I'll update this thread when I get the chance to try a 1200 watt.

If it's not a crappy defective PSU, it should be more than enough. I run two 5970s on 850W PSU and there is still some headroom (the system draws 660W from the outlet which is less than 600W on the DC).

dingus

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Activity: 126

Merit: 100

It boots up I suppose. This is with 2x 5970s. Fans start up, I can tell the hard drive is working, everything seems normal except the "no video signal" from all 4 DVI ports.

Apparently I do not have a powerful enough PSU. I am pretty sure I need a 1200 watt instead of 1000 one. I'll update this thread when I get the chance to try a 1200 watt.

sc8nt4u

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What happens when you have 2 in the system? Does your system see both cards or does it not boot?

I'm running 2x5970 on a Asus P6T SE with a XION 1250w PSU.

gusti

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Quote from: dingus on February 11, 2011, 01:16:44 AM

I am not sure whether to post this in the mining forum or this..I figured the technical support one would fit more. Anyway...so I find out today that my motherboard, Asus M4A89GTD PRO/USB3, does not work with 2x 5970s. I have tried everything to get them to work; from clearing the cmos, switching the psu cables, switching the gpus between slots, using the most recent mobo bios update..and an older version, multi-gpu link cable and no link cable. I have tried everything.

I have a 1000 watt raidmax psu so I am fairly confident it is not the source of the problem. I believe the bios just doesn't support dual 5970s for some reason, although this mobo worked fine with a single 5970 and a 5770.

Any suggestions?

I'm not using more than 1 card per machine, but can you tell more ?
OS ? Are they recognized on the device level ?

dingus

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Activity: 126

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I am not sure whether to post this in the mining forum or this..I figured the technical support one would fit more. Anyway...so I find out today that my motherboard, Asus M4A89GTD PRO/USB3, does not work with 2x 5970s. I have tried everything to get them to work; from clearing the cmos, switching the psu cables, switching the gpus between slots, using the most recent mobo bios update..and an older version, multi-gpu link cable and no link cable. I have tried everything.

I have a 1000 watt raidmax psu so I am fairly confident it is not the source of the problem. I believe the bios just doesn't support dual 5970s for some reason, although this mobo worked fine with a single 5970 and a 5770.

Any suggestions?

Topic: To those with multi-5970 setups: which mobo are you using? - page 3. (Read 8290 times)