Quote Originally Posted by EtherWind View Post
Thanks for the quick reply, I really cant figure else what it could have been. The only other system change is that I dropped in another harddrive since then, but I have a 650watt PSU and am only running a single 8800gtx, so I cant imagine that im out of power head room to push an overclock.

I will try to set it to a 6x memory multiplier manually to see if that makes any difference when I try to start pushing the settings. Thanks for the idea. I will let you know how it goes.
sometimes you can overload one rail of the ps and that can cause problems.
you might try rearranging the power cabling so that you have a more equal load seen by the ps.