I am running 2 4870 X2's in quadfire. It has gotten to the point that if I run any game that goes into full screen mode my system will freeze up requiring a hard reboot. These can be games as graphically intensive as CoDMW 2 or simple popcap games. This didn't used to happen. I have tested the ram and cpu. The vga cards are not oc'd. I have a manual fan profile that sets the fan to 100% and the temps never go above 68C. I have a feeling one of the cards is going out on me. Is there an easy way to determine which card is the coulprit withouht taking them out one at a time? I an running Windows 7 Home Premium x64 with the latest catalyst drivers(9.11).