My system runs this fine..

[iceblink_luck]

I find it very hard to believe that the OP can run the game flawlessly on high settings. I can run it on high setting, but still get the odd stutter and slow down.
I am running it on a system with an Intel i7 2600k@4.6GHz, Gigabyte P67A-UD7 motherboard, 8GB of 1600 Ram and 2xGTX580's (although no SLI on this game yet) - and a 256GB C300 SSD. It is something with the game that'snot quite right, not the system.