It's labeled as 550w peak/450w continuous. The build quality of it doesn't look great, but voltage regulation is within 3%, under 100mV ripple for the +12v and ~32mV for the minor rails, although efficiency is pretty bad.
Originally Posted by PapaSmurf
I seriously doubt that poc 550watt psu can even put out 450 watts and still be in spec voltage and ripple wise.
It isn't great, it isn't even "good". But saying it's a "piece of garbage" and making posts like the above just shows you don't know what you're talking about.