i have the 2010 11inch 1.4ghz/4gb/64gb model and to save space i used the 32bit version. Games dont typically take advantage of the 64bit architecture, well, games that you'll be running on the air anyway. The only thing about 32bit is that it doesnt allow for you to be able to use 4gb ram. But again, for gaming purposes of the air, i dont think youll be running anything that requires 4gb anyway.