Hi, I'm on a 15" macbook pro with an intel i7 2720IQM, (2.2) and an AMD 6750m processor. It's the high end computer from early 2011. When plaing games, I notice that I cannot select the resolution of 1440x900 (native is 1680x1050). I can get 1440x1050, however not 1440x900, and I see other people playing on the same configuration as me at 1440x900. Why can't I get this option? It's a good medium in between 1280 and 1680. 1440 would be nice so I could even out my settings and framerate and keep my resolution sharp.