This is a well understood power optimization strategy called race to idle. It works because there are a lot of periferals taking power in addition to the cpu th

This is a well understood power optimization strategy called race to idle. It works because there are a lot of periferals taking power in addition to the cpu that you can’t switch off until the cpu is done. There is also definitely a sweet spot. If you overclock the cpu too much your performance per watt drops too far and race to idle won’t work anymore.