Do you have a specific you're looking to undervolt or overclock with this tool?
Because it is a command-line tool, it doesn't have a "Start" button. Instead, you run it through the Command Prompt (as Administrator) using specific arguments. AmdMsrTweaker.exe P0=15.5@1.25 P0: Refers to the highest performance state. 15.5: The desired multiplier. 1.25: The target voltage (VID). AMDMSR Tweaker V1.1 64 Bit
Ensure you have the correct 64-bit digital signature overrides if your version of Windows blocks unsigned low-level drivers. Conclusion Do you have a specific you're looking to
Depending on the architecture, it can allow for different settings across different cores. Why Use It Today? AMDMSR Tweaker V1.1 64 Bit