Originally posted by: Zendeath
I was having random freezes in 3dmarkxx and doom3 when OC'ing the card with the Rev2 1.4 Ultra bios. These occured mostly it seemed at loading screens. If I ran it at stock speeds (400/1100) I had no problems.
Since temps were never that high, my 12v rail was stable, there were no artifacts and the freezes seemed to be a throttling issue when overclocking, I decided to crank my 2d speed up to match my 3d settings (425/1150). After multiple runs of 3dmark01-05 and 2-3 hours of doom3 I haven't had a single problem. Temps in 2d are only up a couple of degrees.
After going through a multitude of performance 3d core/memory speed combinations & bios tweaking - fast writes on/off, system memory timings, Apeture size, yada yada yada - this seems to work for me. Maybe it will help someone else with problems.