Oh, seriously, NEVER believe the recommended system requirements. Those things are probably based on equations which assume your GPU/CPU are working at theoretical maximum efficiency, not real-world tests. Also, stuff like the "minimum" system requirements are something like what is needed for the game to run AT ALL, on minimum settings, probably lagging and glitching like a sonofabitch, but "working".
They do this to get the absolute maximum possible customers buying the game. Do you think they actually care whether or not you can run it satisfactorily? Of course not. Just wait until one of your friends gets the game and ask how it works on their setup. Let THEM be the guinea pig.
Can't wait that long. Maybe that's your problem.
Me? I stay about three years behind the bleeding edge of the tech world. I get the stuff practically for pennies, the stuff you paid thousands for back then.