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How to retrieve P-States?

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Does anyone know how performance states (P-States) available on the particular GPU can be retrieved, and what is the current P-State?

I bet NVAPI can do that (of course for NV cards only), but the appropriate API is not published. NvAPI_GPU_GetDynamicPstatesInfoEx() retrieves only utilization (hidden function NvAPI_GPU_GetPStates does the same). I can get all current frequencies, but how to recognize which P-State they belong?

Thank you in advance!

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