After running OC Scanner for a good two hours with zero artifacts across the board using the tessy screen, my pc seemed to have froze. Looking at the processes on the task manager the processes are not responding. Same problem I get when playing BlOps2 at about the two hour mark when it goes black screen on me. Anybody have any ideas what I'm experiencing? Thanks a much. PC not overclocked yet. Haven't got around to that. Just sitting at default settings.