@OP
fortunately you're so lucky cause the games is a CPU whore, no matter what GPU you have you still need to have a monster CPU to get a constant of 60FPS, and you do have the 2500K, but you might wanna OC it a little bit.
Might have to turn off adaptive AA tho, and just go with MSAA.
Really, you shouldn't use AMSAA in this game because it causes a lot of texture issues with various pop-ins as well as textures/characters becoming clear. 8xMSAA with FXAA works great, and at least for me I've gone with 4xSSAA+FXAA which is ultimate IMO.
I used to us MSAA, but then I took an arrow in the knee.