Question CPU overclock disables Crossfire

Titanion

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Dec 8, 2002
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When I overclock my Athlon II X4 640 to 3.5 GHz, and it was Prime95 stable all afternoon, my Crossfire is disabled.

HD 5850x2

I can't even find the 2nd card.

When I load up Windows 10 on default settings, Crossfire is working.

What bios setting could do this? CPU/GPU is async.

I thought it was power, but I put in a Corsair 750W.

It is an Asrock AM2+ motherboard. I can post the model when I get home.

Thanks
 

Titanion

Distinguished
Dec 8, 2002
1,359
0
19,290
1
I'm searching through the default settings and seeing which ones make a difference. If I take the top card out and use the bottom PCIe slot, it boots up fine overclocked. Something is messing with the Crossfire.

What settings might mess with the PCIe slots?
 
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