330W? I dont think it will be working much longer, your going to meet the cap for that pretty soon.
Dude, the 6600GT requires a minumum of 350W... You have the 6800, and I can imagine that it is a little bit higher. You are not doing your system any justice.
From what I've heard about Hiper over at XS, it is good, but not the best. Stick with OCZ or Antec if you want the best. Or you can go spend several hundred on your PSU, and get THE BEST! I'm not sure what it is, YanBooth has it, it's 850W and absolutely magnificent.