i have a
Black Edition AM3 AMD Athlon II X4 640, (4x 3.00GHz)
Nvidia GTX 470
4GB DDR-3 RAM
gotta say: after hours of playing i just can't remember even one time where my system got slow evenough for me to notice low fps...
btw: i have a tv-card in my PC that was running simultaniously a tv-program on my TV (tv is linked with pc via HDMI)... usually when i play, my girlfriend is watching TV...
so with your cpu overclocked to 3.8 GHz and the GTX 560 and only playing the game you should have no problems...
