2260121 :
Or the ultimate solution, buy 2 i7 3930k and buy a motherboard that can run both and overclock them to 5ghz each... :lol:
Would have to be 2 Xeon's, not i7's...
Regardless, OP, just be happy with what you have. There really ISN'T much you can do at this point.
An i7 3960x (and a X79 board, of course, with 64GB Quad Channel RAM) would be about as far as you can go for a single CPU system, should you choose to go in that direction, but you'd just be doing it for e-peen status only.