So i have this old system I have been gaming on a lot recently, It also has a GTX 660, 6Gb of Ram and a Athlon II X4 645 CPU. I have been throwing around the idea of changing the CPU for months now, but I am not sure if it is worth the hassle. I would need a new Mobo and I been eying a fx6300 or fx8320. I feel that the CPU may be holding me back in games, but I am not really sure to be honest. Lack of L3 cache from what I understand is not that big of a deal for gaming, but I am not sure if it is becoming problematic with the newer releases that are coming out like COD:AW and AC:Unity. Any suggestions or ideas would be much appreciated