Quote Originally Posted by Gilhooley View Post
There seems to be a lot of confusion about computer wattage. PSUs ain't 100% effective. Current new models have 80plus certs and a few with more, but thats best case scenarios. 80% efficiency is a realistic value and for you in 110V land maybe a little less.

This means that if you measure at the wall a 100W draw you're using 80W, the rest is heat in the PSU. This also means that a rated 500W PSU at maximum load will draw 625W from the wall..

So when you see statements like "the system draws 450W" which alludes to a killawatt measurement, that's only the maximum for a 360W PSU.
Many sites will factor that in...