What is the interface that change the cpu frequency and the core voltage on the windows platform?

From Windows Native Processor Performance Control(document link).

From Windows Native Processor Performance Control(document link) Parameters to P-state policy Several parameters to Windows processor performance state controls are configurable via registry keys. These keys are provided with the intent that OEMs and system designers may tune the performance of Windows processor power management features to best suit specific platform designs, and allow adjustment to help achieve maximum battery life and realize the best system performance. And you have to restart to have the changes take effect.

I think he's talking about real overclocking – humbagumba Aug 13 '10 at 15:02 @humbagumba, then its gonna be processor specific I think. I'm pretty sure this is the most exposed that windows will make the processor, due to the extreme potential in the user screwing something up. – James Aug 13 '10 at 15:06.

Microsoft Windows does not have an API for overclocking / underclocking a CPU. You would have to roll your own using your assembler skills.

I can do no more than point you in the right direction. I think through Windows Management Instrumentation (WMI) you can get at a COM interface that allows modification of some sub-systems. Hopefully that vague bit of information will set you on the right path.

:-).

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