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Crossfire HD 6950 doesnt boot

Last response: in Graphics & Displays
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November 28, 2011 11:05:49 PM

Hi guys,

I'm having a problem and I can't find a solution. I have a PC with a Crossfire configuration (2x HD 6950), but when both cards are powered on the PC doesnt boot. It goes to the POST, and after the POST it reboots, and keep doing this. If I disconnect the power of one card, the PC boots perfectly.

I tried changing the slots, booting with each card, and everything seems to be ok, but if I boot with both card powered on, my pc doesnt boot.

Here are my specs:

MOTHERBOARD: MB GIGABYTE|GA-Z68A-D3H-B3 Z68 1155
PROCESSOR: CPU INTEL|CORE I7 2600 3.4G 8M R
HARD DRIVE: SSD 120G|OCZ AGT3-25SAT3-120G R
VIDEO CARDS: 2 x VGA XFX|HD-695X-CNDC HD6950 2G R
MEMORY: MEM 4Gx4 GSKILL F3-12800CL9D-8GBRL (16 GB TOTAL)
DVD BURN LG | GH22NS70 OEM
PSU ROSEWILL|RX850-S-B 850W RT

Motherboard and PSU are Crossfire Ready, and just in case, I tested with a PSU Corsair TX750 v2, but I have the same problem.

Anybody have some idea? :( 

Thanks
PN
a c 153 U Graphics card
November 28, 2011 11:11:25 PM

Well I almost want you say you're lying about trying another PSU, because it definitely sounds like that is the problem. I would have bet on it.

Could be a bad PCI-e slot, nothing left but that. Try one card in the second slot alone.
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November 28, 2011 11:30:29 PM

I tried... both cards alone in each slot, they work great... slots are ok, and cards also... i was thinking that it was the PSU, but the one I tried today, corsair, it's certified by ATI (you can see in their website)...

:( 
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a c 153 U Graphics card
November 28, 2011 11:46:14 PM

Doesn't matter if its "certified" or not. I had an old PSU that was SLI certified by Nvidia, damn thing couldn't even run a single card.

Regardless of that it definitely sounds like a power problem. If you really tried both the Corsair and the Rosewill, then try another. The Corsair should have been fine. I coulda guessed that Rosewill wouldn't have been able to do it though.
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November 28, 2011 11:49:48 PM

Ok man, thanks...
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