Yeah, to do higher speeds(switching cost, F) you need higher voltages (V) so your power/heat goes up by non-linear variant of F*V. Depending on what your savin

Yeah, to do higher speeds(switching cost, F) you need higher voltages (V) so your power/heat goes up by non-linear variant of F*V. Depending on what your savings are for idle power it can either make sense to run long and slow or try and burst to a deep sleep state.