E8400
There's no way I should only be getting TEN FPS in Arma2 and 3 with everything off and everything turned down to minimum
That doesn't sound right at all.... *googles*
http://www.pcgameshardware.com/aid,687620/ArmA-2-tested-Benchmarks-with-18-CPUs/Reviews/
Arma is CPU heavy, but you should be getting 20fps (6850 should be similar in performance to the 4890 used in the benchmark)
That said, since it is CPU heavy you should see a significant increase with your new setup.
Yay upgrading!
(but keep an eye out for good GPU deals)