For example for a processor i7-11370H ('High Performance' Power Plan)
# Maximum processor frequency
# By default the max CPU frequency is set to 0 -> the frequency is not limited.
# It should be understood that the frequency adjustment works discretely, as in the case of the states.
# Switching is still done between P-states, and the closest minimum value is selected.
C:\Windows\System32\powercfg.exe /SETACVALUEINDEX SCHEME_MIN SUB_PROCESSOR PROCFREQMAX
4200It looks something like this