I'm waiting to post my experience setting up a Asus pb287q 4k monitor until I can solve one minor irritation. Running a Thunderbolt to Display Port 1.2 cable I am enjoying 4k @ 60hz (no lag) but when I put the Macbook Pro into clamshell the ASUS monitor blacks out and returns but it reverts to 30hz. Can I run in clamshell @ 60hz?