SysTool is an allround tweak and overclocking utility for enthusiasts.

SysTool Features
Motherboard Monitoring
ATI Video Card Overclocking
NVIDIA Video Card Overclocking
Enhanced Intel SpeedStep Control
AMD64 Cool&Quiet Control
HDD Acoustic Management
Changing chipset memory timings for i855/i848/i865/i875/i915/i925/i945/i955 and AMD64
Changing CPU FSB (includes ABIT uGuru)