my processor is only a amd +4200 duel core, they are pretty old now but bioshock runs like a dream on it.
Games now are finally starting to use BOTH proccessors on duel cores (no, they didnt before, even when they were supposed to, like fear. They just used one whlie the other sat their idle or handled some other programs/services you have running) so slightly older duel core proccessors suddenly get twice as fast!
You might want to get something a bit better than that though if your expecting to play games like alan wake when it comes out, that will probably eat my processor alive, i need to upgrade for that
