Not addressed to me but my I5-3750 , 8gb and 1x ssd and 3x2T disks running 24/7 with 6 4MP cams at 15FPS and Plex Media Server uses approx 80-90Watts from the wall with approx 30-50% CPU. I already find that a lot.
p.s. I have my home automation (HomeAssistant) running on dedicated NUC that...