The "very high" preset (assuming 1080p) should be achievable with ~40FPS on average..... with a couple of tweaks (shaders, shadows etc on "High" opposed to V. High) should put you more in the 50FPS range.
Admittedly, this is only "some guy on Youtube", but would appear to validate this.
https://www.youtube.com/watch?v=LqADO-UCt1A
G4560 vs your 2600, but your CPU is still pretty strong.