@ Jason G: "ATiTool" is N/A since I'm nVidia-based (Vidcard & Mobo).
Give it a try, you'll find it works just fine
http://www.techpowerup.com/atitool/ATITool is an overclocking utility designed for ATI and NVIDIA video cards.
Design target is to write a light-weight application for the enthusiast - so no questionable registry tweaks. Sorry.
This is the utility to look for. Newest available I think is 0.26, but there may be a newer version. Note the "Scan for Artefacts" Button.