UPDATE: 2880 / 1920 = 1.5 and the iPad 3's Retina display (at least) is a very precise linear RGBRGBRGBRGB arrangement - http://www.extremetech.com/wp-content/uploads/2012/03/ipad-3... - so running 1920 wide on 2880 would essentially result in "pixels" of RGBR BRGB RGBR BRGB and so on with an extra "shared" green across two pixels. I'm NOT a display or color expert and really hope someone who is will respond but that seems to me like it could render rather nicely with some fringing between sharply contrasting colors (e.g. yellow and blue or green and magenta).