I recently bought a 13" Ultimate MBA and am wondering whether anyone thinks it will be able to run Portal 2 when it comes out later this month, or whether I should hang onto my Early 2008 15" MBP before selling it just to play the game. Note that I am not a picky gamer. I just want it to run smoothly at medium (perhaps even low-ish) settings. System reqs. from Steam are: OS: MAC OS X 10.6.6 or higher Processor: Intel Core Duo Processor (2GHz or better) Memory: 2GB Hard Disk Space: At least 7.6 GB of Space Video: ATI Radeon 2400 or higher / NVIDIA 8600M or higher ...so I guess the question is whether the 320M in the Air is considered as good as or higher than the 8600M?