The 2016 MacBook is capable of driving a 4K display at 60 Hz via a single USB-C cable. Such a feat is achievable via an easy-to-apply IOKit patch.
One of the great things about the new Intel hardware inside of the 2016 MacBook is that it’s capable of supporting 4K resolution at 60 Hz. The jump in refresh is a big deal, as anyone who’s tried to put up with running a 30 Hz refresh rate can attest to.
Operating at 30 Hz results in jerky and choppy cursor movement, and in some cases can induce headaches after prolonged use.
The good news is that it is possible to enable 60 Hz at native 4K resolution and 1080p (HiDPI/Retina) resolution on a 2016 MacBook. In fact, I just did so on the LG 27UD88 4K USB-C monitor that I recently reviewed. Watch the step-by-step process in our video tutorial for the details.
I don’t understand why this is even necessary, but at least it’s possible. I can confirm that using a 4K, or any display for that matter, at 30 Hz is impossible for in the long run. It should be also possible (I assume) to run the display @1.6x, which results in a 2560×1440 pt workspace, which is what I’m using on my Eizo.