I realize this thread hasn't been active in a while, but I'm struggling to solve my problem... It looks like you have a VGA to Thunderbolt adapter, and with it your MBP is outputting 2560x1440, correct? My two displays are 2560x1600, and while I can use apps like QuickRes to "display" 2560x1600, it isn't crisp (clearly some sort of software upscaling). I've tried straight HDMI, Thunderbolt to HDMI, and Thunderbolt to DisplayPort, and in NONE of these does OSX give me any options above 1920x1080. It's almost as if it is unable to read the correct EDID data and thinks my displays are limited to 1080p. Is it possible that the VGA adapter is avoiding that issue by not reporting any EDID data at all? Would a Dual DVI (capable of 2560x1600) to Thunderbolt adapter accomplish the same task? And am I going to have the same issue when I go from a MBP to a Mac Pro?