First and foremost, always monitor system info..e.g.,temps, voltages,
etc
using utilities such as CPU-Z and GPU-Z when attempting to overclock
in order to avoid 'cooking' your system:
CPU-Z--
http://majorgeeks.com/CPU-Z_d425.html
GPU-Z--
http://majorgeeks.com/GPU-Z_d5796.html

Depending on the model AMD/ATI graphics card, you can use either:
AMD Overdrive --
http://sites.amd.com/us/game/downloa...uirements.aspx
(Note: If AMD-ATI Catalyst/Vision Control Center is installed, click AMD
Overdrive tab).


AMD GPU Clock Tool--
http://downloads.guru3d.com/AMD-GPU-...load-1985.html