I'm not impressed if this is where the iMac display is potentially going , the current GPUs can barely drive the resolutions they have now in anything other than simple desktop apps . , can you imagine what video card you would need to drive a game (say portal 2 which has low to modest requirements) at 30fps + on a screen with 3200 or higher resloution ? Well whatever that GPU is , apple will ship with the one released 2 years ago and half the RAM it shipped with on the PC .
I love the mac OS , I love the mac design , I hate the "last years tech with a shiney shell" we seem to have to put up with , super high res screens and faster I/O ports are all well and good , but put a decent GPU in now the mac is becoming a contender as a home gaming platform .
Think I ranted a bit then , sorry![]()
Desktop rendering performance at a retina display resolution would not be an issue with any modern Mac that shipped with a retina display. As for games, you do not have to render the game at the native screen resolution. The OS X implementation will almost certainly be the same as the iOS implementation. That is, a doubling of the vertical and horizontal resolution.
A game running on a 3840x2160 retina display can render at 1920x1080. No filtering need be applied by the monitor as it is an exact multiple in each direction. A 1920x1080 output resolution from a game would look exactly the same on a 3840x2160 display as it would on a 1920x1080 display. Every 1 pixel in the rendered image would take up 4 pixels on the higher res display. You can test this out on your Mac now with any game that allows you to select a resolution that is half the vertical/horizontal resolution of your current monitor. That is assuming the display is not stupid enough to filter resolutions that are an even division of it's native resolution. Most won't apply any filtering in those cases.