ATI Catalyst Tweak Guide
 

This guide is more than just about how to perform a few advanced tweaks with the Catalysts.
Whether you use the official Catalysts or the Omega drivers, this 10-page guide has
something for you. It covers the entire driver installation, setup, troubleshooting
and tweaking process from start to finish. From descriptions of important
video-related BIOS settings to advice on what other drivers are necessary for
optimal graphics performance, how to install and set everything up, how to clean
your machine out of older drivers and devices, benchmarking, overclocking and
easy-to-understand descriptions of graphics options. Heck even Nvidia users will
benefit from reading this guide!

http://www.tweakguides.com/ATICAT_1.html