so im go to just guess that the temp sensor be off on my unit , catalyst control center never spin up the fan to anywhere near max , and the screen will start to twitch and eventually it crash the system . I have to go in and manually set my fan speed to 80-100 % to prevent this . other than that , run crysis warhead at max detail at 1920x1200 , pretty happy about that . Update : take off 2 more star , even after up the fan speed , still have graphic glitch , i have to UNDERCLOCK my memory 100mhz to make it stop . terrible . I think i get a 6850 in disguise here . maybe I get unlucky here , but still , do some testing before you put something out for sale .