I've noticed an issue with my system now that I've been using it a few days. When using anything graphically intensive (so far I've tried Furmark, Unigine Heaven, Left 4 Dead 2, and Starcraft II) the system randomly locks up well after starting the game. It's not a BSOD; it's a complete freeze of the content on screen that needs the power button to be held in order to resolve. I'm stuck in determining what is causing it. I'm left with 3 options: a cooling issue, a issue with Windows 8/AMD's drivers, or a flaw in the cards. I would normally just say it's a software issue and wait for the next driver release to occur, but I don't want the return period to expire on my cards if they are the problem. Does anyone have any suggestions on how I can diagnose or fix this?