I know there's many of these x79 aimed squarely at gamers, but in all honesty you'd need to be a game-building-rig... builder... and a client with cash to spare.
I'm hoping very much that I get proved otherwise in the months to come, cos right now I'm yoyoing over the purchase of these things (not ASUS from previous experience) - results for me don't have the gamers in mind. New gfxcards may change that opinion. And of course there are some gaming boards in the ranges that come with shiny stuff.
On a professional and benching-enthusiast basis, you gotta get onboard. I'd not argue with that. Any meger %age gain is a bonus. If you pay for it yourself - ouch.
Love to see the P9X79 versus the 58/68 in the gaming stakes. Doesn't do anything for me. (right now)