Recently i upgraded my rig from an i5-4670k to an i7-4770k. Adding more threads i thought would bring a increase in framerate. Unfortunately it hardly did. I am guessing and reading up, and it seems that only the clockspeed will do that. The i5 was a 3.4 and the i7 is a 3.5 clockspeed. Not much better. And that proves to be the case.
I am thinking of upgrading to the latest i7-6700k at 4.2, but that also requires a different memory setup and mainboard. We will see when that happens if my framerates will go up.
My current framerate is about 25-30 on 3 screens, sometimes 40. But with lots of settings not to the fullest.