Not used a Hiper eh? They aren't quite PC P&C, but their damn good and far from cheap.
While playing about, a while back. it withstood; 2 7950GT's at 660/850, 4600+ @ 3.0, 2x36gig Raptors, 4 250gig maxtors, 2gig PC4000 Ballistix at 3.0v(basically my system + another 7950GT and pushed further than usual) which comes to about 620w according the PSU calculator, and used lamost every connector on the PSU.
Had no problems what so ever. The PSU fan was on full but the air coming out was barely warm. I'm sure other people with Hiper Type-R's will happily defend them.