I just got in my first LG 27” UltraFine 5K 27MD5KA-B display (7680 x 4320), so far so good with the display, but my reason for writing this is not the display. All of our workstations since the G5’s have all had dual displays connected for the artists and this is the first dual display set-up with a 5K and an Apple Thunderbolt display, so it made me remember the Thunderbolt/HDMI bus configuration from my Apple MacPro Late 2013 Qualification training. Make sure when installing multiple displays Don’t connect more than two displays to any bus. Make sure their split between one of the three busses. Also if using HDMI displays you will need an adapter to connect to one of the Thunderbolt ports of another bus. Below is a diagram of the MacPro Thunderbolt bus configuration: