StarTech.com MSTDP123HD 3-Port Multi Monitor Adapter
Features
Use this adapter to connect three independent displays to a single DP 1.2 port
- MULTI MONITOR ADAPTER FOR WINDOWS: DisplayPort to HDMI MST hub drives up to 3x HDMI monitors in extended or duplicate mode using a DP port on Windows desktop PCs or laptops | Not compatible with macOS
- DISPLAY RESOLUTION: Multiple monitor DisplayPort to HDMI MST hub supports HD resolutions up to 3x 1080p 60Hz on three monitors, or dual 4K 30Hz on two monitors, or can support three ultrawide displays up to 2560x1080
- COMPATIBILITY: 3-Port DisplayPort to HDMI MST video splitter requires host system with DP 1.2/HBR2/MST or later from HP, Dell & Lenovo and AMD, NVidia & Intel video cards; Not compatible with laptops/computers with HDMI output ports
- INCREASE PRODUCTIVITY: Increase productivity by extending your desktop at your workstation in the office/home office; MST technology uses your GPU/video card performance to deliver uncompressed video and use minimal system resources
- GPU CAPABILITIES: Please verify maximum number of displays supported by your GPU; Some GPU chips (such as Intel HD Graphics) are only capable of supporting a maximum of three displays (laptop screen may be disabled when connected to three monitors)
This MST hub lets you connect three HDMI® monitors to your DisplayPort™ (DP) 1.2 equipped Windows® laptop or desktop.
Increase productivity with multiple screens
The newest generations of computers are more portable than ever, which often means that you're left with fewer video outputs and smaller integrated screens. This MST hub solves both of these problems by letting you connect three additional displays to your computer, which makes multitasking much easier.
Configure your displays for any environment
Using the MST hub, you can extend your desktop onto additional monitors and stream independent content to each display. You can also mirror the same image onto multiple HDMI televisions or projectors for remote viewing applications such as digital signage.

Enjoy amazing video quality without draining system resources
MST technology uses your existing video card to minimize the use of system resources while delivering Ultra HD 4K resolutions. This unprecedented performance makes MST perfect for high-resolution applications such as graphic design, gaming and medical imaging.
Note: When using a DisplayPort 1.1 video card the MSTDP123HD will act as splitter, automatically mirroring your video source across all displays. Resolution limitations apply.
The MSTDP123HD supports plug-and-play installation for a hassle-free setup, and is backed by a StarTech.com 3-year warranty and free lifetime technical support.
Note: MST shares 21.6 Gbps across all attached displays. Higher resolutions can restrict the available bandwidth with the remaining ports, please see our guideline below for determining an ideal resolution for your setup. Certain graphics adapters have limited MST support and will only output to three displays in total. If more than three monitors are attached the fourth will be disabled. Some monitors limit available resolution
Average Resolution Bandwidth Allocation
- 1920x1080 (High-definition 1080p) @60hz - 22%
- 1920x1200 @60hz - 30%
- 2560x1440 @60hz - 35%
- 2560x1600 @60hz - 38%
- 3840 x 2160 (Ultra HD 4K) @30hz - 43%
Note: Exceeding 100% will reduce functionality.
Examples of Supported Resolution Configurations

Applications
- Use one screen for reference data such as websites, while composing in another screen
- Dock your DP 1.2 device and add three high-resolution displays at your workstation
- Create a panoramic video wall for HDMI digital signage applications using your DisplayPort computer
- Edit images, video or audio clips across three displays in any orientation or resolution
- Perfect for spanning a spreadsheet or worksheet across three displays, to avoid side-scrolling
- Enjoy the panoramic views built into games and display helpful codes and walk-through data on a third display, at the same time
Specifications
Technical Specifications
| Connector A | 1 - DisplayPort (20 pin) |
|---|---|
| Connector B | 3 - HDMI (19 pin) |
| Operating Temperature | 0°C to 40°C (32°F to 104°F) |
| Storage Temperature | -20°C to 70°C (-4°F to 158°F) |
| Humidity | 50-90% |
| Active or Passive Adapter | Active |
| AV Input | DisplayPort - 1.2 |
| Ports | 3 |
| AV Output | HDMI - 1.4 |
| Audio | Yes |
| Chipset ID | MegaChips - STDP4320 |
| Package Height | 2.7 in [6.8 cm] |
| Package Length | 9.7 in [24.6 cm] |
| Shipping (Package) Weight | 1.1 lb [0.5 kg] |
| Package Width | 6.0 in [15.3 cm] |
| Package Quantity | 1 |
| Audio Specifications | HDMI - 7.1 Channel Audio |
| Maximum Cable Distance To Display | 49.9 ft [15.2 m] |
| Maximum Digital Resolutions | 3840 x 2160 @30hz |
| Supported Resolutions | Note: MST shares 21.6 Gbps across all attached displays. Higher resolutions can restrict the available bandwidth with the remaining ports, please see our guideline below for determining an ideal resolution for your setup.Average resolution bandwidth allocation1920x1080 (High-definition 1080p) @60hz - 22%1920x1200 @60hz - 30%2560x1440 @60hz - 35%2560x1600 @60hz - 38%3840 x 2160 (Ultra HD 4K) @30hz - 38%Note: Exceeding 100% will reduce functionality. |
| Wide Screen Supported | Yes |
| Weight of Product | 4.5 oz [127.0 g] |
| Color | Black |
| Material | Plastic |
| Cable Length | 7.5 in [19 cm] |
| Product Length | 13.0 in [33.0 cm] |
| Product Width | 4.1 in [10.5 cm] |
| Product Height | 0.6 in [1.4 cm] |
| Power Source | AC Adapter Included |
| Input Voltage | 100 - 240 AC |
| Input Current | 0.5 A |
| Output Voltage | 5 DC |
| Output Current | 3A |
| Center Tip Polarity | Positive |
| Plug Type | N |
| Power Consumption (In Watts) | 15 |
| OS Compatibility | Windows 11, 10, 8.1, 8 |
| Included in Package | 1 - DisplayPort to 3x HDMI MST Hub1 - Universal power adapter (NA/EU/UK/AU)1 - Quick install guide |
| Brand | StarTech.com |
|---|---|
| Product Type | TV & Home Theatre > AV Splitters & Switches |
| Weight | 0.51 kg |
| Warranty |
|---|
Note:
Warranty period is as stated above unless the manufacturer has chosen to specify a longer period.
All warranties are return to base unless otherwise specified.
Shipping Information
- Free NZ-wide shipping on orders over $299
- Standard delivery 2–5 business days
- Rural delivery may take an additional 1–2 days
- Same-day dispatch for orders placed before 2pm (weekdays)
Returns Policy
- 7-day returns on unused items in original packaging
- Faulty or damaged products covered under warranty
- Contact our support team to initiate a return








