DisplayPort multi-monitor adapter StarTech MST14CD123DP — USB-C to 3× DisplayPort, supports up to 4K 60Hz

The StarTech MST14CD123DP is a USB-C to 3× DisplayPort multi-monitor adapter that converts a single USB-C or Thunderbolt port into three independent DisplayPort outputs. Designed for multi-display workflows, the adapter enables extended or mirrored desktops and supports up to 4K at 60Hz per compatible output when used with a host and cables that provide sufficient bandwidth. Its compact design and Plug-and-Play operation make it suitable for workstations, trading desks, design studios and monitoring stations that require multiple DisplayPort connections from a single USB-C port.

Advantages

The adapter provides a simple way to multiply DisplayPort outputs from a single USB-C connection without additional docking hardware. It supports high-resolution output to multiple monitors, reducing cable clutter and simplifying multi-display setups. Built with compatibility for DisplayPort displays, it enables flexible display arrangements (extended or mirrored) and maintains support for 4K at 60Hz on compatible displays, depending on host capability and cable quality.

Suitable for

• Multi-monitor productivity setups (extended desktops)
• Trading and financial workstations with multiple screens
• Graphic design and video editing with high-resolution displays
• Monitoring stations and control rooms requiring several DisplayPort outputs

Key specifications

• Input interface: USB-C / Thunderbolt compatible port
• Output interfaces: 3 × DisplayPort outputs
• Max resolution per output: up to 4K (3840×2160) at 60Hz, depending on host and cable
• Video mode: supports extended and mirrored display configurations
• Power: powered via host USB-C port (no separate power supply required under normal operation)
• Form factor: compact external adapter for desktop use

How to use

Connect the adapter to a compatible USB-C or Thunderbolt port on the host computer, then connect up to three DisplayPort monitors to the adapter outputs using DisplayPort cables. Configure the display arrangement in the host operating system display settings to set extended or mirrored mode, adjust resolution and refresh rate as supported by the host GPU and monitor capabilities. Ensure that the host port supports the necessary display bandwidth and that DisplayPort cables and monitors are rated for the intended resolution and refresh rate.

Usage recommendations

For reliable 4K at 60Hz performance on multiple displays, use high-quality DisplayPort cables and verify that the host USB-C/Thunderbolt port and graphics hardware support the combined bandwidth. If the host cannot provide sufficient bandwidth, reduce resolution or refresh rate per display. Place the adapter where ventilation is adequate and avoid using passive USB-C extension cables that may limit signal integrity.