I have managed to under-volt my Intel 8750H by 150 mV using https://github.com/kitsunyan/intel-undervolt. But I am not sure if the settings are really applied.
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The readme provided explains it:
Run
intel-undervolt read
to read current values andintel-undervolt apply
to apply configured values.
The output will show applied settings. Run intel-undervolt read
first to check, then intel-undervolt apply
, followed by another intel-undervolt read
to verify that new settings is in fact applied.

vidarlo
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Debian 11, i9-10980HK CPU
. – Lounis Sep 12 '22 at 11:18