Hello! I just installed this card before 2 weeks but my system seems to have a problem when GPU is on full stress. This happens only in 3 games (COD Ghosts, Red Faction Armageddon and Assasin's Creed Liberation HD) at random times when I play. My other games( f1 2013, fifa, pro, trials evolution, assasins creed black flag, battlefield etc) are fine. At first, this was happened more often, and now that I underclocked my cpu to 3.6ghz with less voltage, It seemed to be a little more stable for 2 days, until it crashed once again last night while i was playing. My screen just goes black and the system crashes(sound remaining at first moments) and the only thing i can do is restart. My thought is that I have a PSU problem(I have THERMALTAKE TR2 550W). Sapphire says 750watt supply is required, and also i have read in forums that this card needs almost 350watt in full stress! Really hungry.. If this info is correct, I feel that I need a new PSU.. I hope it is that way, I dont want to think that card is damaged. I must mention that I dont have any other problems, like flickering or black screen, or crashes when i dont play games. And this happens only in these 3 games I mentioned above. Also PSU is really noisy when I play games..The same thing happened with my old 7950, but now I have these crashes,too. I haven't tried another psu till now, I just want to ask your opinion. Any help from you will be valuable. Thanks in advance.