You can connect as many as four displays in these configurations:
- Two 5K displays with resolutions of 5120x2880 at 60Hz
- Four single-stream transport (SST) 4K displays with resolutions of 4096x2304 at 60Hz
- Two multi-stream transport (MST) 4K displays with maximum resolution of 4096x2304 at 60Hz
- One 5K display at 5120x2880 at 60Hz and up to three SST 4K displays at 4096x2304 at 60Hz*
You can connect LG UltraFine 4K displays and LG UltraFine 5K displays in these configurations:
- Two LG UltraFine 5K displays configured as dual-link SST 5120x2880 10bpc at 60Hz
- Four LG UltraFine 4K displays configured as SST 4096x2304 8bpc at 60Hz
- One LG UltraFine 5K display connected to port 1 or 2 and two LG UltraFine 4K displays connected to ports 3 and 4 (see the figure in the next section)
*Connect the 5K display last.
Connect to Thunderbolt ports on different buses
Connect your displays to the Thunderbolt ports on your iMac Pro. Use different Thunderbolt buses when possible (see the figure). Don't connect more than two displays to any bus. If you connect a 5K or MST 4K display, you need to use a different bus for each of these displays.
When you start up your iMac Pro, the built-in display illuminates. Other connected displays show an image after your Mac is finished starting up. If one or more displays don't show an image after startup is complete, make sure your displays and any display adapters are connected properly.
- General information on using multiple displays in macOS including using extended desktop and video mirroring
- Display configuration support for previous Mac Pro models
- Using 4K displays and Ultra HD TVs with your Mac
- Using adapters to connect HDMI, Thunderbolt 3 (USB-C), Mini DisplayPort, and other types of displays