You'd gain a lot more power in your GPU's however it'd be smarter to get 6950 2GB's and flash them to a 6970.
You don't need this motherboard, your better off going with the Asrock Extreme4 P67 and saving $100. That money is better spent on the GPU or better SSDs. They'll perform the same running CF @ 8x/8x so there wouldn't be any difference between the WS Revolution and the Asrock Extreme4 P67.
Are you just gaming with this computer, if you are you should be getting the 2500K instead. It'll save you money and gives you the same performance and overclocks. The 2600K is mostly for HT which doesn't help at all in gaming.