So i just recently bought a 4890 for my system. at first i had windows xp and i overclocked my cards Core from 850 to 950. and the Memory clock tp 1175. (not sure what the stock is). Everything ran great and i got no artifacts or errors whatsoever. Now i installed windows 7. And i have a couple direct x 10 games, crysis and farcry 2. Almost immediatly i started getting artifacts, like clue squares showing up here and there. I moved the clocks down each by 50mhz. At first is seemed to work but after 15 misn of playing i slowly see more and more blue squares pop in and out. Is it possible that the overclock is stable in dx9 but not in dx 10? im sure exactly how it works.
did you try directx9 games on windows 7? maybe the dx10 is messed up or something...you can download the setup for it from microsoft and it can update it for you if needed. Try that and then see what happens if the oc was stable in xp then it would be stable in 7 becuase the software shouldnt have anything to do with the stability of the hardware
Now i tried Call of Duty world at war and there are no artifcacts, but there is one little glictch, 2 or 3 little yellow dots on their faces, i know its not artifacts cuz i played for a while and nothing else happend, so i think it has something to do with Windows 7 and direct x.