A64CLK (AMD64 Clock Utility) is a simple utility designed for realtime CPU frequency monitoring and realtime adjustment of the CPU multiplier (FID) and voltage level (VID) of the upported CPUs via processor's power management model specific registers (MSRs).

An AMD64 (AMD K family CPU supporting processor performance states transitions (known as AMD PowerNow!в„ў or AMD Cool'n'Quietв„ў technology) is required.

The presence of this feature is automatically detected at the program startup.

A64CLK is implemented as both GUI and command-line utility. For a command-line launch, use A64CLK.exe FID , where FID is a CPU multiplier value to set, and VID is a CPU voltage to set (optional).

What's New in This Release:

В· Realtime CPU usage determination using the CPU performance counters.
В· FID/VID values locking (preventing from being changed).
В· FID/VID automatic management (based on the CPU usage).
В· Additional configuration options.