Gigabyte P31 motherboard
Intel Core2Quad Q6600 running at 3Ghz per core
2GB Giel Black Dragon DDR2 PC-6400 RAM
Nvidia GeForce 8800GTS 320mb
Runs on 1024x768 full screen AA everything ramped up to max...
My rigs is similar to you, but not the processor. Never think it affects that much. Hom many fps average?