3D Game Man posted a review on the Ultra X3 1600W Modular Power Supply

There's no question that the Ultra X3 1600W Modular Power Supply has a lot of power. Considering your typical computer build only requires 500W or less, is there any need for 1600 watts? Well, if you have the very latest hardware installed, there might be. If you have an ATI 2900XT Crossfire setup and lots of other hardware installed it can easily eat up 700-900 watts of power. That's still leaves a lot of power for other uses or for future hardware that will consume even power. The fact is, this power supply has all the power you'll ever need, comes with modular FlexForce cables and two quiet fans. This puts it into a class of its own! Watch the video to find out more and check out the bloopers at the end.

Ultra X3 1600W Modular Power Supply Review