Does anyone know of a way of forcing the HDMI output (on an rMBP in this case) to allow > 1920x1080 outputs? In this case it's not a hardware limitation. I installed Windows 8 on this laptop, and it is able to push 2560x1440 just fine over HDMI. So the GPU clearly supports it. Edit: It seems OSX for some reason does not allow the HDMI port to function at >165MHz. If I set the refresh rate to 40Hz via SwitchResX (which is low enough that 2560 can fit within the bandwidth provided by a single link at 165MHz), the display works at 2560 just fine. However, I should be able to run 60Hz (or even higher). I'm able to do so in Windows - the hardware is obviously capable.