Why would I want this? With a properly configured kernel, Intel chips can downclock to somewhere in the 400-800mhz range when idle.
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Intel's 13/14th gen CPUs draw significantly (~70-100W) more power on boost, which can stress the VRMs in otherwise correct pairings and lead to current/EDP or power limit throttling. Lowering the voltage at certain frequencies can allow the system to sustain higher clocks without performance degradation.