(The FriendlyName is "Upper bound for processor performance throttling", and Description is "Maximum percentage of processor capabilities to use. Lower percenatage may result in better battery life, but possibly lower performance.")
Then the "Processor Power Manager" setting and "Maximum processor state" value is shown in Power Options / Advanced Settings dialog window. I can change it and see it is updated when running "powercfg query“ in Command window:
Power Scheme GUID: 381b4222-f694-41f0-9685-ff5bb260df2e (Balanced) GUID Alias: SCHEME_BALANCED
Subgroup GUID: 54533251-82be-4824-96c1-47b60b740d00 (Processor power management) GUID Alias: SUB_PROCESSOR
Power Setting GUID: bc5038f7-23e0-4960-96da-33abaf5935ec (Maximum processor state) GUID Alias: PROCTHROTTLEMAX Minimum Possible Setting: 0x00000000 Maximum Possible Setting: 0x00000064 Possible Settings increment: 0x00000001 Possible Settings units: % Current AC Power Setting Index: 0x00000062 Current DC Power Setting Index: 0x00000062
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