Just posting this because I know I couldn't find any information about this anywhere. Just got my 4k 28" ASUS PB287Q a couple days ago. I was worried that there were going to be screen glitches like with the Samsung U28D590D. I'm happy to report that the PB287Q appears to work perfectly at 60hz (on a new mac pro with stock "low-end" ATI card). Just have to change the displayport mode from 1.1 to 1.2 in the monitor settings. I think this makes this monitor the one to get for Mac Users. I got it for $650 from Newegg. Pretty happy with it so far. It does feel small though compared to the HP 30" one I was using before. The screen is very sharp (like looking at a Retina Macbook/Ipad), but at the viewing distance at my workstation, its not a jaw-dropping difference from my previous monitor.