The wattage rating label for the PSU, as you can see on the
specifications page, up to 1000W of the 1100W that this PSU can supply
can be drawn from the 12v rails. That is a seriously beefy amount of
12v power. The UL number indicates that this PSU has been made by
Cooler Master, which means it hasn’t been outsourced to another
company and just had Cooler Master stickers thrown on it.

http://www.xtremecomputing.co.uk/review.php?id=429