I'm running two cubes with a 600w psu on each.  If i set them to high one will trip the psu off right away and the other takes a few hours but turns off as well.  I'm running them on low so I don't have to keep on top of them as much.

http://i.imgur.com/wnVqGgm.jpg?1
http://i.imgur.com/rQ7gK4S.jpg?1
http://i.imgur.com/kvFg5m7.jpg?1

-herener