If you haven't had the privilege of trying Omegadrive's video drivers, let me quote Omega himself: Omegadrive provides alternative drivers for both ATI and Nvidia cards. Personally, they're all I used for my Windows systems. You can check out the rest of the interview I've quoted here, and Omegadrive's homepage can be found here.
omega drivers are a little unstable on some cards , but its good that it lets you overclock your graphics card withough having to tamper with the graphics card's bios
