This tool let's you control the frequency and fan settings of your AMD/ATI video card. It depends on the proprietary AMD/ATI Catalyst display driver and makes use of the AMD Display Library (ADL).
Edit frequencies and voltages of GPU and memory
Change color temperature day/night (inspired by f.lux)
Constantly monitor temperature, fanspeed and perf level
Show some information about your AMD/ATIRadeon video card
Create a custom fan control profile