I would say its the FX card casuing your issues. Change the game to DX9 mode and see how much it improves. I'm running Core i5 750 clocked at 3.2ghz on stock cooler with a GTX 275 and getting around 40 FPS on max on DX10 @ 1280x1024 That is all on high expect vsync. If i stick DX9 mode it doubles the FPS. If i had seen the post when you made it i would have said get the i5 750 and only getting 4gb of ram as there is nothing out there that uses 8gb atm, then spend the rest on getting a 275 or AMD FX card. Still a nice system you have there though
Kut...