Jeantech Absolute 1000w Modular PSU Review
 

The rails on this PSU look very beefy, and the breakdown shows
that most of the power comes from the 12v rails (Certain manufacturers
cheat the wattage ratings of their PSU’s; by pushing up the 3.3v and
5v rails to amounts that will not be used in modern computers as
modern computers need lots of power on the 12v rail. And this power
supply has plenty of 12v juice).
http://www.xtremecomputing.co.uk/review.php?id=391