Good going, I use a 480 for my cards also, but you know that, The X version makes it all much simpler to over volt. My memory doesn't come close to what your cards can do and memory clocks make a huge difference in benchmarks, I am very interested in what scores you can achieve. Best of luck to you.
Your not the only one, I have 2 hard drives with windows 7, one I have a lot of processes disabled, one is for everyday use, both with 313.96 drivers, my everyday drive doesn't play with sli and the new 3DMARK, score is embarrassing low, the other system works fine and I have scores in the upper end of 680's, which once again can't touch 7970's in benchmarks. I just made a run this morning on a drive with win 8 and got the highest score I've seen on 680's, Futuremark identifies my driver incorrect on win 8 for some reason but my graphic score is higher than on win 7 at a higher cpu clock, but physics score is lower, don't figure