im thinking of going to a c2d system,cause i find my current rig is getting on a bit,got my mind set on an e6600,evga680i mobo and corsair 2gb 6400xms c4 ram kit,will i notice much of an improvement in games (mainly cod2 and joint ops) if i move to this set up as opposed to what i currently have, i mainly like to play games on my 20 inch display at 1680x1050 whenever possible