2. Is the UD-3900C4 Compatible With ...

Is the UD-3900C4 Compatible With Thunderbolt 3/4 Hosts?

Last Update: October 7th, 2026
Article ID: 2834990

Yes. The UD-3900C4 is compatible with most computers equipped with Thunderbolt 3 or Thunderbolt 4 ports.

How Does the UD-3900C4 Work With Thunderbolt Hosts?

When connected to a Thunderbolt 3 or Thunderbolt 4 computer, the UD-3900C4 operates as a USB-C docking station using the USB and DisplayPort capabilities provided by the Thunderbolt port.

HDMI 1 and HDMI 2 use DisplayLink technology and require DisplayLink software. HDMI 3 and HDMI 4 use the host computer's native DisplayPort video output through Alt Mode and Multi-Stream Transport (MST).

For the latest DisplayLink software and installation information:

https://plugable.com/pages/displaylink

Are There Any Limitations on macOS?

Yes. macOS does not support DisplayPort MST for multiple independent extended displays.

As a result, HDMI 3 and HDMI 4 cannot operate as two separate extended displays on a Mac and will mirror each other. The UD-3900C4 can therefore support up to three unique extended displays on macOS: two through DisplayLink on HDMI 1 and HDMI 2, and one native display across HDMI 3 and HDMI 4.

Applicable To

  • UD-3900C4, Thunderbolt 3, Thunderbolt 4