Not looking promising. Decent, for a non-Xfire PSU.
My vote is that with the rest of that sweet hardware you're spec-ing out, this thing has absolutely no business being in your system. Grab a Corsair 650TX or 750TX for another $50-ish, and don't worry about it again. If cable-management is a concern, consider a 620HX which has modular cables.
And if you're not OC-ing, that motherboard is serious overkill. Take a look at the
PQ5 Pro, much cheaper, same chipset (w/same Xfire support), half the price.