There is always a way to improve the performance of your system through overclocking. The EVGA 8800GTS 640MB is already overclocked compared with Nvidia's 8800GTS reference board. We were curious to see if the card could handle even more overclocking. Using coolbits registry "hack", we enabled overclocking features in Nvidia's control panel. We tried Ntune to find the optimal performance, but the system halted everytime we tried.

Our next attempt was with RivaTuner v2.00 Final, which was successful. Overclocking was selectable! Next step was the trial and error procedure, raising the frequency, running 3D Mark06 to stress test VGA card, until we had a stable state:

The EVGA 8800GTS 640MB proved to be overclockable. We got 13.62% increase for GPU core and 15.29% increase for memory. Below is a table illustrating the various graphics cards compared in this review and their overclocking capabilities.

After setting the highest possible clocks, we ran a few tests to see if performance also improved or not.

In 3D Mark05 and 3D Mark 06, there is an improvement. We tried several games and also saw an increase in framerate. Overall, we are satisfied with the overclocking capabilities of the EVGA 8800GTS 640MB.