I can say that I have never seen a PSU as stable as my pc p&c 1kw. It hardly varies at all. I have completely loaded the thing up before with 6 dvd burners, 10 hds, 2 7900gtxs, my venus, 8x120mm fans, 4x80mm fans, and all wc stuff without even the slightest hiccup. It is massive though and doesn't fit in some cases. ok most cases
The fact that there is only one FDD power adapter is a down fall with DFI mobos and probably one of my only gripes against the psu. Overall I LOVE THIS PSU!