Apple just added external Retina display support in a recent beta of OS X Mavericks 10.9.3, According to 9to5mac. 4K monitors can now run the operating system at a pixel-doubled resolution, like on a Retina MacBook Pro. It could also be a sign that Apple is getting ready to release a long-anticipated external retina display.
Like on the MacBook, the display setting screen will allow you to “scale” the resolution. You can choose between the native 4K resolution or a Retina-like resolution with bigger windows but sharper text. It increases the pixels per inch density.
When it comes to software support, Retina-optimized apps for the MacBook Pro are already optimized for the external Retina displays. It uses the same HiDPI method.
But the most challenging part of supporting external Retina displays comes from connectivity. While Thunderbolt 2 is capable of transferring 20 Gbits per second, Apple’s website only promises
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