A new CPU isn't going to help you much man. I also cannot recommend one if I don't know what motherboard you have, as the Athlon 64 X2 is a pretty old design and nobody can recommend buying into old tech. If I were you I'd attempt a slight OC on the CPU and GPU, provided you have the cooling system for it, and save that $200 for a new motherboard/CPU combination. It's the best you can do at the moment, if you're not looking to buy disappointment.