I have a BFG GeForce6800 Ultra. After installing the latest Nvidia drivers, I use a registry entry file simply labeled "geforce overclock" that I got from a friend. All this does is open an extra option in the video card properties window, called clock frequencies. Then you can manually set the speeds for both the gpu and memory, test it for stability, and even auto detect how much the card is overclockable. It's basically the same option that the omega drivers add, but allows you to keep using the Nvidia driver(which I prefer). You may be able to do a google search on this registry file.