I don't think PowerTop's been mentioned. Maybe because it's more useful for a laptop than a server. Once calibrated, it can output a HTML report on a machine's

I don't think PowerTop's been mentioned. Maybe because it's more useful for a laptop than a server. Once calibrated, it can output a HTML report on a machine's consumption, which includes a handy list of tunable power saving options. It was written by Intel so it may, or may not, work that well on other processors. https://01.org/powertop https://01.org/powertop