This model isn't the first to have some heavy-duty GPU capability, though. Joining that display is some serious graphics horsepower, thanks to an AMD Radeon R9 M290X, which comes standard with 2GB of dedicated video memory, but can be configured with 4GB as well. Photo editors and graphic artists will have similar benefits, as they can now see their work in magazine-quality high resolution like never before. For anyone working with 4K video, that extra screen real estate is indispensable. With that 5K display, you have the resolution available to run 4K video at full resolution, and still have room to spare for all of the toolbars on the side and bottom. It's an amazing achievement for screens, to be sure, but what does it mean for users? Who really needs something with 5K resolution? However, the new iMac's Retina display has a whopping 5,120-by-2,880 resolution, leap-frogging past the 4K standard to an impressive 5K. Where the regular iMac 27-inch has the same general dimensions, it boasts a 27-inch, LED backlit 2,560-by-1,440-pixel display. Let's start at the most obvious comparison: the display.

It has been a long time coming, but now that it's here, do you need one? And how does it compare with the Apple iMac 27-inch (Intel Core i5-4670), which already holds a place as our Editors' Choice for high-end, all-in-one desktops? That's how many glowing specs of light are packed into the new Apple iMac 27-inch desktop, now with a 5K Retina display.

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Imac 27 late 2013 screen