If my computer idles at around 90W...

wintersnow

Honorable
Jan 4, 2014
24
0
10,510
and I use a SeaSonic X Series X650 Gold, then the PSU is at less than 20% load.

Does the efficiency of the PSU lower significantly? and, it bad for the PSU and computer parts?

thank you in advance.
 
Solution
The efficiency will drop yes. As with most components, they are designed to work best at a set load. It won't do any damage though or increase wear.