I got to play the PvP closed beta last weekend using bootcamp and vista 32 bit ultimate. I have the ati mobility 1600 with 128 mb ram and four gigs of system ram. Had to agree to Nda so I can't talk about the game itself. I do plan on playing but not till I get my iMac or MacPro with 8800gt if I go that route. My mbp can't really keep up with the game, and that was the dx9 client (dx10 client was not available to anyone). Hope that gives you a little help
EDIT: I forgot to mention, I do play eq2, cod4, orange box, world in conflict, and a few other games without issues in bootcamp, to give reference to what does play well