I tried to post this thread before, but our dog scared the hell out of the cat, so he tried to hide behind my computer that slowly went off of that. I hope that damned cat didn't kill my computer. Very well, how do I overclock a PowerColor ATi X1950Pro 512Mb (594:695,25)? I tried to overclock it through Catalyst with it's ATi Overdrive, and it said it were safe to use 621:796,50. That's an increase of 27:101,25. I ran 3DMark06, and were given an increase of over 100p, maybe 140p. However when I started Sid Meier's Civilization IV there were artefacts already in the Main Menu and after 4-6 seconds Windows Vista freezed. This was not a problem of overheat as the temperature only went from 39*c to 48*c, an increase of almost 10*c. Is it impossible to overclock this card, or what are your opinions?