I have my 8800gts 640mb overclocked to 630gpu/1020ddr3. I am currently using Vista 64. The program I use to overclock is Rivatuner. I dont really see any difference in performance though. Im too lazy to download 3d mark06 again and test to see if any difference is being made. I guess my question is; is there any other programs that I can use to test to see if there is any difference being made in my overclock other than 3dmark?