Originally Posted by Teny
I thought PSU only produce less than whats written, unless it only applies to the cheap ones.
This is kind of true.
This is the problem when manufactures state PSU power outputs.
The Antec BP 500 stated above will produce 500W and this is believable because the PSU will need 660W to produce the 500W output. I'd say this is the absolute maximum power output this PSU will achieve and not a long term value.
It's hard to measure the output power of PSU's and what I do is to read very hard into the specifications, make a few calculations and read up on the kind of components used in their design.
EDIT: Just checked out a bit more on this PSU.
Ive seen a minimum
stated efficiency for this PSU at 70% which means an absolute minimum output is 462W. At 500W, if achievable, the PSU would be operating at 76% efficiency. Pretty good at that price.