ATI Linux GPU Overclocking
 

When it comes to overclocking ATI Radeon graphics cards under
Linux the only real option has been using rovclock. Rovclock is a Radeon
overclocking utility written and developed by Sebastian Witt. This tool
has been in development since 2005 but it took quite a while before the
Radeon R300/R400 series was even supported. Rovclock still lacks support
for the Radeon X1000 (R500) series, however, there is a new contender to
the ATI Linux GPU overclocking arena and that is ATIpower. We have covered
the ATIpower overclocking utility today at Phoronix.

http://www.phoronix.com/vr.php?view=9367