Gotta agree with Petey. if you are wanting to try to eek out a leetle bit more performance, try Omega drivers:
OmegaDrivers.net - Home of the ATI & NVIDIA Omega Drivers. ATI
Choose you operating system and then download. Follow the instructions given in the ReadMe and then install.
Omega drivers have been dissected and reconstructed to squeeze out more performance. While they use an older driver set than what is current, that won't be a problem for anyone not running the newest cards.