The catch
Plugable TBT-UDM
It has a single downstream TB port and Gigabit Ethernet. At most two native outputs are available, and the host may support fewer. Charging is advertised at 100W and certified at 96W.
Side by side
TBT-UDM vs TBT-UDT3 from Plugable: HDMI screens stay simple with UDM, UDT3 holds three TB branches in reserve
Quick verdict
Two direct HDMI outputs are on the TBT-UDM, and three downstream TB ports are on the TBT-UDT3. To keep two HDMI monitors and one TB accessory on a supported host, go with the UDM. For two compatible USB-C screens and a TB drive, or for the 2.5GbE and higher supported host power, go with the UDT3. HDMI screens need adapters on the UDT3, and it does not support TB3 hosts. Neither dock overrides the laptop’s native display limit.
Before you buy
Why, and what it costs you
The flexible dock may call for the very adapters you wanted to get rid of
Take two HDMI monitors and a TB-only drive. The UDM covers that with two direct HDMI sockets and a separate TB branch. On the UDT3, two suitable HDMI adapters take up two of its three branches and the third is left for the same drive. Either dock can therefore handle that supported setup, but the UDT3 means buying adapters and adds more connector points. If the monitors already take the needed picture over USB-C, the UDT3 turns into the cleaner direct-connection option. Base the plan on the screens that will really stay on your desk. Having three TB sockets or two HDMI sockets does not prove your laptop can drive both displays.
Where this comes from
Assumes direct branch allocation, with one compatible adapter for each HDMI screen and no daisy chain. The UDM’s native display maximum and the host limits still apply.
The catch
Plugable TBT-UDT3
There are no fixed HDMI or DisplayPort outputs, and HDMI adapters are separate. Each downstream port supplies up to 15W, and TB3 hosts are not supported.
Plugable TBT-UDM
- Why pick it
- Your two HDMI screens and one TB device connect with no separate monitor adapters.
- A second laptop, supported TB3 or video-capable USB-C, can live with the UDM’s documented single-display fallback.
- The catch
- It has a single downstream TB port and Gigabit Ethernet. At most two native outputs are available, and the host may support fewer. Charging is advertised at 100W and certified at 96W.
Plugable TBT-UDT3
- Why pick it
- Three direct branches are needed for two compatible USB-C displays and a TB-only drive.
- The desk includes a capable 2.5GbE NAS path or a compatible higher-power USB laptop.
- The catch
- There are no fixed HDMI or DisplayPort outputs, and HDMI adapters are separate. Each downstream port supplies up to 15W, and TB3 hosts are not supported.
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What this page compares
Plugable TBT-UDM vs TBT-UDT3 for a two-screen desk that also holds storage. Add up the monitor adapters, look at a second laptop and ask yourself whether a faster network and more power matter.
Both Plugable docks are native, and both suit the same two-screen work desk. One is built around direct HDMI, the other around flexible TB branches. The monitor inputs you already have, and the next accessory you buy, can flip the decision.
Which one fits
Pick the situations that sound like you
Run two HDMI monitors with no video adapters to buy
On a supported host, the UDM gives you two direct HDMI outputs.
- Plugable TBT-UDM
- Better fit
- Plugable TBT-UDT3
- Caution
Use three direct branches for two USB-C screens and a TB drive
Three downstream TB branches are on the UDT3.
- Plugable TBT-UDM
- Caution
- Plugable TBT-UDT3
- Better fit
Live with the single-screen fallback on a verified older host
The UDM documents that fallback, whereas the UDT3 rules out TB3.
- Plugable TBT-UDM
- Better fit
- Plugable TBT-UDT3
- Caution
Run a capable 2.5GbE NAS path with no additional network adapter
The faster Ethernet interface is on the UDT3.
- Plugable TBT-UDM
- Caution
- Plugable TBT-UDT3
- Better fit
In practice
Differences you will notice
The flexible dock may call for the very adapters you wanted to get rid of
Take two HDMI monitors and a TB-only drive. The UDM covers that with two direct HDMI sockets and a separate TB branch. On the UDT3, two suitable HDMI adapters take up two of its three branches and the third is left for the same drive. Either dock can therefore handle that supported setup, but the UDT3 means buying adapters and adds more connector points. If the monitors already take the needed picture over USB-C, the UDT3 turns into the cleaner direct-connection option. Base the plan on the screens that will really stay on your desk. Having three TB sockets or two HDMI sockets does not prove your laptop can drive both displays.
How we worked this out
Assumes direct branch allocation, with one compatible adapter for each HDMI screen and no daisy chain. The UDM’s native display maximum and the host limits still apply.
A second laptop can make the faster dock the wrong buy for the household
Picture a couple sharing a desk, where one has a new Thunderbolt laptop and the other has an older TB3 machine or a basic USB-C work laptop that can output video. The UDT3 excludes TB3 hosts, so do not buy it on the belief that the familiar connector guarantees a fallback. The UDM documents a single-display fallback for supported older connections. That keeps one work screen usable, but it does not preserve a two-screen experience and does not get around the limit on a base M1/M2 Mac. Settle exactly which older computer is involved and what fallback is acceptable before anything else. That question often matters more than getting the top Thunderbolt generation for the newer laptop.
How we worked this out
Based on the manufacturer’s exact host requirements and the UDM’s documented fallback. No claim of universal compatibility or a dual-display fallback.
Backing up to a NAS can be reason enough for the newer dock, with the monitors unchanged
Say family media or work files go to a NAS through a capable 2.5GbE switch. The UDT3’s built-in 2.5GbE lifts the lower Gigabit link ceiling of the UDM. How much you gain depends on the NAS, the disks and the rest of the connection, so a faster dock does not guarantee a faster backup. If that network job comes up often and would otherwise need another interface, the monitor adapters can still be worth including. The UDT3’s higher charging ceiling is its own check, since a PD 3.0 laptop is held to the documented 100W. The headline 140W does not apply to it. Base the decision on the copy job you repeat and the laptop you own. Two maximum numbers will not settle it.
How we worked this out
Rests on verified 1GbE versus 2.5GbE and PD 3.0/3.1 host limits. It estimates no time saved and guarantees no simultaneous bandwidth.
Option A
Plugable, TBT-UDM
Plugable TBT-UDM
Your two HDMI screens and one TB device connect with no separate monitor adapters.
- Best for
- Your two HDMI screens and one TB device connect with no separate monitor adapters.
Facts we checked
- Direct HDMI outputs: Two
- Downstream Thunderbolt: One TB4
- Ethernet: Gigabit
- Host charging: 96W certified, 100W advertised
Option B
Plugable, TBT-UDT3
Plugable TBT-UDT3
Three direct branches are needed for two compatible USB-C displays and a TB-only drive.
- Best for
- Three direct branches are needed for two compatible USB-C displays and a TB-only drive.
Facts we checked
- Direct HDMI outputs: None
- Downstream Thunderbolt: Three TB5 at up to 15W each
- Ethernet: 2.5GbE
- Host charging: 140W PD 3.1, up to 100W PD 3.0
Spec by spec
Where they really differ
| Spec | Plugable TBT-UDM | Plugable TBT-UDT3 | In practice |
|---|---|---|---|
| Direct HDMI outputs | Two | None | If you keep two HDMI monitors, the UDT3 picks up two adapters. |
| Downstream Thunderbolt | One TB4 | Three TB5 at up to 15W each | How you connect the monitors decides how many branches are left. |
| Ethernet | Gigabit | 2.5GbE | Every part of a faster NAS path has to be capable, end to end. |
| Host charging | 96W certified, 100W advertised | 140W PD 3.1, up to 100W PD 3.0 | The profile your laptop accepts sets how much of the charging benefit you can use. |
| Older host fallback | Documented single-display TB3 or video USB-C fallback | TB3 unsupported | Look at the second computer before you pick a dock around the first. |
Trade-offs
What each pick costs you
With Plugable TBT-UDM
- Check both laptops and the exact display paths. DisplayLink software cannot add hardware that this dock does not have.
With Plugable TBT-UDT3
- Allow for the video adapters you need and any power for a portable screen. Host charging reaches up to 140W with compatible PD 3.1 and 100W with PD 3.0.
Change of plan
When the answer changes
HDMI screens you already own or an older second host come first
Go with Plugable TBT-UDM. The UDM needs fewer adapters and has a documented, limited fallback.
Native USB-C screens or faster local networking take priority
Go with Plugable TBT-UDT3. Within the exact host limits, the UDT3 fits that connection plan.
Decision guide
Before you buy
The new dock should outlast today’s monitors, with no paying for adapters and no loss of compatibility with the second laptop used at home.
What this page can’t tell you
- Nothing here compares measured throughput or charging time.
- A dock cannot add to what native displays the host supports.
By the numbers
What the data shows
What we found across the docking stations we compare, plus the checked facts behind each finding.
Show the facts and the math
| Product | Needs it meets | Facts we checked | Sources |
|---|---|---|---|
| Plugable TBT-UDM |
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| Plugable TBT-UDT3 |
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Ready to buy
See today’s price and what owners say
Open either model on Amazon for the current price, customer reviews and delivery options.
Plugable TBT-UDM
Your two HDMI screens and one TB device connect with no separate monitor adapters.
A second laptop, supported TB3 or video-capable USB-C, can live with the UDM’s documented single-display fallback.
See price & reviews on AmazonPlugable TBT-UDT3
Three direct branches are needed for two compatible USB-C displays and a TB-only drive.
The desk includes a capable 2.5GbE NAS path or a compatible higher-power USB laptop.
See price & reviews on AmazonEach link opens in a new tab.
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