I have a Dell Precision 490 with a Foxxconn ls-36 mobo, 4 gb RAM, a Radeon HD 7770, and two Intel Xeon 5160 Dual Core CPUs running at 3 ghz. I recently bought the 7770 GPU and installed it. Everything went fine, but the CPUs are holding me back now as far as gaming goes. I guess the GPU is being bottle necked by my CPUs. So my question is: what are the best dual CPUs that I can buy that fit in my motherboard? I would like to play games like GTA 4, Battlefield, and Call of Duty, because my processors now are preventing me from playing them. Thanks for the help.