Good day to you all! I just recently purchased a Sapphire 7870 OC Edition gpu to replace my 2x6870 crossfire gpus. After setting up the card (old drivers were uninstalled and wiped clean) and installing the latest CCC/ATI drivers I encountered this problem wherein my PC freezes whenever I play 3D games. A photo of the problem is attached. The problem occurs with several games (CODBO2, Skyrim, Modern Warfare 3, Hitman Absolution, etc.) and at random, sometimes I'm 3 mins into a game and my PC freezes, sometimes an hour, and the most is after 2 hours playing a game. The screen goes green (sometimes orange or black) with white vertical lines. I can still hear the sounds of the game (it goes on), ctrl+alt+del, altF4, alt tab, and pressing the power button once does not work so I just reset my unit. I reformatted my PC cause that's what forums ultimately advise to fix the problem but it still happens. - I tried stress testing my PC (default timings and clocks and also OCed) and the results are stable. - Fur Mark results are stable. - Catzilla, 3DMark 11, Lavasoft stress test, all yielded stabke results. - my temps are fine ranging from 39C to 57C. I did almost all that I can think of to determine the culprit but I can't. Just now I played Assassins Creed 3 and the problem showed itself once again. My specs: i5 @3.2ghz, MSI P55 GD85, 2x2GB Corsair 1333mhz DDR3, 4x WD Black 500GB, Sapphire 7870 OC Edition, Corsair TX750 watts, Asus optical drive. I would really appreciate your help. Thank you!