I had to restart my new computer 20 times to find a good undervolting spot for everyday use.
Currently I am fighting with the 50W frontier for the whole system (not screen) for full (~30% underclocked) CPU use.
Other people overclock, I do the opposite, getting 70% of power for 50% of juice. And can always change to max power if I need. But try to tell that someone else.
"You slow your system intentionally?"
"No, you dont feel it. I just have 2 configurations, one for gaming demanding games, one for everything else, and saving 100-200€ over the livetime for a day or two of fiddling and 3 clicks sometimes."
Disclaimer: Normal people are better off just using the now very effective and advanced power saving things that are active by default on not-old computers. A desktop idling under 30W is amazing.
If you - like me - are donating computer power to science, it pays to undervolt, especially if you run it 10+ hours a day or even 24/7