Is there a good free program for overclocking my graphics card???

Hey ya'll, I was just wondering if there was a good free program that I can use to overclock my graphics card. I have previously used powerstrip, but didn't like it all that much for various reasons. Any help would be appreciated.

Thanks,
Lee

what kind/brand of video cardf?!!?

if an ATi card go here

http://www.ocforums.com/showthread.php?s=&threadid=260642

Highly recommend this app. Love the artifact tester!