This is an overclocking and monitoring Tool from AMD and allows you to manage clocks frequencies of all their Radeon cards, this new update supports the new Radeon 4800 (RV770) series.

[0.9.2] Nov 30, 2007
    - RS780 clock support
    - external thermal controller support
   
[0.9.3] Dec 15, 2007
    - added support for G781-1 thermal controller
    - added UVD activity status and PCIE status report
   
[0.9.4] Feb 25, 2008
    - fix crossfire slave clock change issues including R680 in newer drivers
    - engine/memory clock to show what is currently used by hardware before new clock is applied
   
[0.9.5] Mar 3, 2008
 - fix engine/memory setclock issues on RS780 with production driver installed

[0.9.6] Mar 14, 2008
    - fix application stability issue on certain RV670 designs
   
[0.9.7] Apr 30, 2008
    - add support for RV770 and RV730
   
[0.9.8] June 10, 2008
    - fix RV770 TSS reporting in thermal sensor page

Download - click here
 

download: AMD GPU Clock Tool v0.9.8