Has anyone out there successfully overclocked their graphics blaster?!? I've got a utility that let me do it. I've been using Quake II to test it. By default, the core speed is at 95 and the memory speed is at 110. I tried moving the core to 105 and the memory to 120 but when I start Quake II there are horizontal line on the screen. When I moves the speeds back to where they were, the lines disappear. I've gone to great lengths to make sure heat is not a problem. I took the heatsink off the video chip and replace it with a Lasagna X heatsink/fan and I've put a slot fan directly underneath the video card.

So, is there some kind of core/memory speed ratio I need to consider? Help, help!