The 580W Hiper was never recommended for DFI mobos in North America, as there are so many better (& cheaper) choices available.
The Hiper 580W can not do highend SLI, impossible!
However with just one 8800GTS (not a GTX), you "might" squeek by.
My recommendation is either the Corsair 520W/620W non-SLI or the PC P&C 750W Quad for SLI.
Good Luck,
Dave