"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.
"The first and only release available at this time for ATIpower is version 0.1, which was released this past October. This utility is designed for changing the frequency of the GPU and memory on Linux--you can either underclock or overclock with ATIpower..."
