Getting atikmpag.sys BSOD when Crossfiring

[Moshi]

I have two AMD 6950s that I use for mining and gaming which were able to Crossfire well originally. After a reinstallation of Windows 7 Professional 64-bit, when Crossfire is enabled, starting nearly any modern game (IE: Metro 2033, Crysis 1/2/3, etc) gives a stop error pointing to the infamous atikmpag.sys. Crossfire still works in Ubuntu 12.04 32- and 64-bit.

I've tried using various versions of CCC - pretty much everything 12.x and 13.x so far - to no avail, netting the exact same problems as before. I'm not sure what else - besides a reinstallation - would help.

For the record, one of the cards is Visiontek's 1GB card, while the other is Sapphire's 2GB "Dirt 3 Edition" card.

Any insight?

[MysteryMiner]

Two major possibilities:

1. Bad Catalyst version. Use that one who worked previously.

2. Bad hardware. Failing card or improper settings configuration.

I will test the cards on another test computer for stability if that is possible.

[Moshi]

Thanks for the input, but I doubt either is the issue. I've both tried many, many versions of Catalyst with no luck, and can crossfire the cards in Ubuntu with no problems. I'm rather certain this is some driver related problem, but have no idea how I can remedy it after no version works.