Plugable UD-ULTC4K
Plugable docking stations

Plugable UD-ULTC4K

The UD-ULTC4K offers three display channels with a choice of HDMI or DisplayPort on each. Six physical video sockets therefore mean three monitors, not six. That distinction is the first thing to settle when planning cables.

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Consider it for

  • Three 4K office screens with mixed HDMI and DisplayPort inputs
  • A workstation needing an SD reader and laptop charging

Check before buying

  • DisplayLink installation and permissions required
  • Only three monitors despite six video sockets

Match each pair to one monitor

You can mix monitor connector types without buying adapters solely to make every screen identical. The current version supports three 4K displays at 60Hz when its native channel receives a suitable DP 1.4 Alt Mode signal. A DP 1.2 host reduces that native channel to 4K30; the two DisplayLink channels follow a different path.

Check the exact configuration and included power supply.

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Check which generation is in the listing

Plugable documents an original version and an updated version introduced in 2022. The current catalog entry has three HDMI/DisplayPort pairs and up to 100W host charging, with 96W certification. Do not carry specifications from the newer version into a used listing that shows the older connector layout.

Choose this for workspace, not just pixel counts

A three-screen research or administration desk can benefit from the connection choice and card reader. A buyer whose key task is color-critical work or protected streaming should investigate a native-video alternative. DisplayLink requires software and has workload limitations; a large maximum resolution does not remove them. The display architecture matters more than the number printed on the box.

Connections & compatibility

Connection to laptop
USB-C with DP Alt Mode; DP 1.4 for full triple 4K60
Display technology
displaylink
Maximum displays (conditions apply)
3
Power to laptop (W)
100
HDMI sockets
3
DisplayPort sockets
3
Wired network
Gigabit Ethernet
USB peripherals
4 USB-A 5Gbps; 1 USB-C 10Gbps accessory port
Display requirements
3 × 4K60 with suitable DP 1.4 host; DP 1.2 reduces native channel to 4K30
Mac notes
DisplayLink required for two channels; native output needs Alt Mode
Windows notes
Windows with DisplayLink software; native channel also requires DP Alt Mode

These are published specifications, not results from hands-on testing. Maximum screen counts depend on the laptop, operating system, connection and chosen resolution.

Check your setup requirements

Sources & specifications

Research checked September 11, 2026. Product revisions, firmware and operating systems can change compatibility.

Review the current listing

Confirm model, condition, seller, included cables and power supply before ordering.

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Other Plugable options

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The TBT4-UDZ needs a more careful compatibility check than its four video sockets suggest. Windows and Mac computers use its display arrangement differently, and a USB-C-shaped connection alone does not establish the result.

Up to 4 displays*100W host power*

*Host, software and display conditions apply.

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Plugable UD-3900
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Plugable UD-3900

The UD-3900 makes most sense when replacing the laptop is unnecessary but its connections are inconvenient. It can attach through USB-A or USB-C, so an older machine can keep its keyboard, network cable, and two office monitors together.

Up to 2 displays*No laptop charging

*Host, software and display conditions apply.

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Plugable UD-3900PDZ
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Plugable UD-3900PDZ

A desk with one main screen and two smaller reference monitors is the useful starting point for the UD-3900PDZ. Its three HDMI sockets are not equivalent: one carries native USB-C video, while the other two rely on DisplayLink software.

Up to 3 displays*100W host power*

*Host, software and display conditions apply.

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Understand the setup

Compatibility

DisplayLink vs Native USB-C: Which Display Connection Fits Your Desk?

Two docks can have the same pair of HDMI sockets and still behave differently on your laptop. The useful question is how each dock obtains the picture. Native USB-C video uses the computer’s display output. DisplayLink creates an additional display connection through USB graphics software. Start with that distinction before counting ports.

Read the guide