Richard Harms's Blog
ASUS PB287Q on a MacBook Pro
I recently added a 4K ASUS monitor to my Mid 2014 MacBook Pro, and was quite dismayed to find that the only option for a HiDPI scaled display was for 1080P. After a bit of searching, the answer ended up being rather easy. Out of the box, the monitor was set to use DisplayPort 1.1. By going into the monitor’s settings and switching this to DisplayPort 1.2, the Mac was willing to show all the scaling options that preserve the clarity I was expecting with a HiDPI display.

The monitor setting:

And the options available on the Mac once I switched it: