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Compact black hub with one DisplayPort input and two HDMI outputs

Monoprice Inc.

Monoprice 121974 2-Port DisplayPort 1.2 to HDMI MST Hub

SKU CH-3XVT-E3PS2

Splits one DisplayPort 1.2 signal into two HDMI outputs, mirroring at 4K 60Hz or extending across both at 4K 30Hz for signage walls

  • Changer TypeAV & Computer Adapters
  • FeaturesMulti-Stream Transport (MST) Hub:An MST Hub enables three di
  • Mirror one screen at 4K 60Hz via Duplicate Mode
  • Extend across two displays at 4K 30Hz each in Extended Mode
  • Connect two HDMI monitors from a single DisplayPort 1.2 output
  • Drive video walls for signage in schools, churches, retail
  • MST hub splits one source into two independent 4K streams

Product identity

The Monoprice 121974 is a 2-port DisplayPort 1.2 to HDMI Multi-Stream Transport hub that splits a single DisplayPort signal across two HDMI displays. It serves installers and IT teams who need to drive duplicate or extended desktops in digital-signage, education, worship or retail environments.

Thermals noise and power

The hub draws power from the host DisplayPort connection and requires no external supply, so it adds negligible heat and produces no audible noise during normal operation. Its compact adapter form factor allows it to sit inline behind a workstation or media player without active cooling.

Upgrade context

This hub replaces daisy-chained splitters or legacy single-port adapters that cannot extend independent 4K 30 Hz streams from one DisplayPort output. The jump is worth it when a single GPU port must feed two HDMI screens at 4K 30 Hz or one screen at 4K 60 Hz in mirror mode.

Highlights

  • Mirror one screen at 4K 60Hz via Duplicate Mode
  • Extend across two displays at 4K 30Hz each in Extended Mode
  • Connect two HDMI monitors from a single DisplayPort 1.2 output
  • Drive video walls for signage in schools, churches, retail
  • MST hub splits one source into two independent 4K streams

Specifications

BrandMonoprice
Model121974
Part Number121974
Changer TypeAV & Computer Adapters
FeaturesMulti-Stream Transport (MST) Hub:An MST Hub enables three different display modes on up to four monitors connected to a single Mini DisplayPort output.

Questions about this item

How do I install the Monoprice 121974 MST hub and what step is often missed?

Plug the DisplayPort 1.2 connector into the host, attach up to two HDMI displays, and ensure the source is set to MST mode in graphics settings so both screens are recognised.

What maintenance or replacement will the Monoprice 121974 hub need over time?

No routine maintenance is required; if a port fails or the unit no longer negotiates 4K 60Hz in duplicate mode, replace the hub.

What limit appears first when the Monoprice 121974 hub runs continuously?

Extended desktop mode caps each display at 4K 30Hz, so sustained dual-monitor use hits that refresh ceiling before thermal or bandwidth issues arise.

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