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Can't undervolt on laptop
I'm not gonna dig for it, but I once hardware overvolted a Pentium M laptop CPU by getting the pinout of the socket. I found pins that handled voltage and shunted them with a single thin strand of speaker wire. Bet you could do the inverse to get a hardware undervolt. It was fun, and I got an extra 500Mhz out of that Celeron. My age is showing