[1] Apple 5K “Retina” has 27-inch screen with a 5120×2880 screen resolution and has a super high-resolution screens and it features 14.7 million pixels.

[2] It has a “TCON” timing controller which tells each pixel what to do and when to do it.

[3] It has the latest software update, OS X Yosemite, but lacks the specs for high-end video editing.

[Source] http://www.gizmodo.com.au/2014/11/apple-imac-with-retina-5k-display-australian-review/