Ok. Start PowerShell (with administrator privilege) and execute: Code: Set-ItemProperty -Path 'registry::HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\PowerSettings\54533251-82be-4824-96c1-47b60b740d00\5d76a2ca-e8c0-402f-a133-2158492d58ad' -Name 'Attributes' -Value 0 Then go to advanced Power plan settings dialog, expand "Processor power management" tree node and locate "Processor idle disable" setting node. Set it to "Disable idle". That should disable both P-states and C-states. Check with Code: pwrtest.exe /PPM > pwrtest_ppm.log (don`t forget to launch heavy app during pwrtest run). Btw, since that setting does work on per power plan basis, you can set it individually for each plan.