Well no I have not regulated in this way. I can regulate via end cooling solution. Can run the TEC warmer, used different sized plates, or even stack plates.
At 12v the TEC is actuallty under powered.
Have to be careful using a TEC straight to cpu because if the TEC gets heat soaked, the cpu will overheat with it.
Ryzen chips, if set up just right, could be TEC cooled for daily sub ambiebt temps I suppose.
Maybe a rheostat and 15v power supply.
I did the above out of curiousity and think to have nice results.
By running that Ryzen chip cold, I was able to use significantly less voltage at the same clock speeds.
So at any rate, with temps below 20c on a cinebench run and frozen at idle, The voltage actual during use was only 1.188v.
One thing I discovered is that this processor does not like v-core too low, as it starts drooping the reference clock nearly 1mhz.
Never the less, I find this chip to be a decent leaker. It would be pretty good under LN2 I think.