lose the green series of the Western digital Hard drive. Get at least the blue series or black. The green drives are slow and u will see it in the game when cache loads or a plane comes in with a different skin.
O btw, u are better off with a dual core system with a higher clock rate then a quad core. The game is processor dependent as far as clock speed is concerned. A 3ghz dual core will run the game better/ faster then a quad core running at 2.0 ghz.