Both cards run fine on their own so its not faulty cards, tested mem, run everything at stock, basicly its just driver problems with running two 6950's in crossfire. Its either been system service exception: atikmpag.sys errors or something about the driver reseting. Are these just ATI's poor drivers that im going to have to put up with? Atm im just running one card, i cant be bothered with the hassel, ill stick the other in when a game that actually uses it comes out. edit: also psu is a 850w corsair, so no probs there.