Not sure this is the correct section of the forums, but here it goes:
My specs are basically:
AMD 6870 x1 (slight oc)
I5 2500k (stock)
8gb 1333 ram
Your computer could run this game at 60 fps minimum, mine does. No need to OC your CPU, it runs fine on stock speeds on a last gen chip. If you are into other things like producing videos and rendering though, overclocking will make that a better experience. (provided that you have a good cooler) As for the GPU, a safe overclock is fine and will get you a few extra fps, but airflow is important in you case so it doesn't overheat.