Roark
Lord of Bacon
- Messages
- 1,357
- Location
- North Carolina
The size of the power supply has no effect on your electric bill. If your system uses 500w then that's all the power supply will generate. If you have a 1000w power supply then it has the capability of producing 1000w, but it only generates whats needed.
From what I've seen peak efficiency of a PSU is around 40-60% load (its a slight bell curve), so if you're under-utilizing it you're losing efficiency and paying more to the electric company for power that is essentially wasted.
Granted the difference isn't enormous, but over time why throw away money like that.
(cool thread I found about it here)