Mini DisplayPort 1.2 to 2 HDMI MST Hub - Dual Display Productivity

In this review the SIIG Mini DisplayPort 1.2 to 2 HDMI MST Hub is evaluated as a practical tool for users who need to drive two external monitors from a single Mini DisplayPort output. The bottom line is that it is best for Windows systems and certain Surface models that support MST, offering flexibility to run two independent displays or a combined panoramic video wall. It is not a fit for Mac OS users who need extended displays, and real-world reports show mixed longevity and occasional picture inconsistency, so buyers should weigh the convenience against those tradeoffs.

Key Features

• Dual HDMI outputs: Lets a compatible Mini DisplayPort 1.2 system connect up to two HDMI monitors for extended or mirrored setups.
• Multiple display modes: Supports Mirror, Extended and Panoramic Video Wall modes so users can choose cloned content, independent desktops, or one large combined display.
• High bandwidth: Provides a true 21.6Gbps video bandwidth to maintain higher resolution streams and reduce compression artifacts in supported modes.
• 4K capability: Supports single 4K@60Hz or dual 4K@30Hz depending on system and display capabilities for sharper text and video where supported.
• Audio passthrough: Carries up to 7.1 surround sound at up to 192kHz sampling rate so audio can travel with the video signal to HDMI displays or AV receivers.
• Compatibility notes: Works with many Windows systems including Surface Pro 4/5/6 models listed, but Mac OS does not support MST so extended mode is not available there.

Who It's For

This hub is aimed at Windows users, IT professionals and productivity-focused users who need to expand a single Mini DisplayPort into two HDMI displays without a dedicated GPU with extra outputs. It is also useful for digital signage or trade show setups that use MST to create a panoramic video wall from multiple monitors.

Customers who rely on Mac laptops for extended multi-monitor setups should look elsewhere since Mac OS lacks MST support and will mirror both displays. Also, buyers seeking an ultra-durable or guaranteed long-life splitter should consider that some users report mixed longevity and intermittent signal issues.

Pros & Cons

Pros

• Enables two-monitor setups from a single Mini DisplayPort with flexible display modes for productivity.
• Supports high bandwidth and 4K options, useful for sharper desktop and video work on compatible systems.
• Audio passthrough for multichannel sound simplifies AV connections through HDMI.
• Clear compatibility guidance for supported Microsoft Surface models helps buyers judge fit.

Cons

• Does not support Mac OS extended mode; Mac users will only get mirrored displays.
• Some customers report inconsistent picture quality and reduced lifespan in a minority of units.

Specifications

Brand	SIIG
Input	Mini DisplayPort 1.2
Outputs	2 HDMI ports (MST hub)
Video bandwidth	21.6Gbps
Resolution support	Single 4K@60Hz or dual 4K@30Hz
Audio	7.1 surround up to 192kHz
Compatibility note	Not for Mac OS; compatible with select Microsoft Surface models

Our Verdict

The SIIG Mini DisplayPort to 2 HDMI MST hub is a practical, cost-effective option for Windows users who need dual-monitor setups or video wall configurations from a single port. It offers solid bandwidth and audio support, making it good value for compatible systems, but Mac users and those seeking guaranteed long-term reliability should consider alternatives.

Frequently Asked Questions

Will this hub work with a Mac to run two independent displays?
Answer. No, Mac OS does not support MST so the hub will only mirror displays on Macs rather than extend them.

Can the hub run two 4K monitors at 60Hz each?
Answer. No, it supports a single 4K@60Hz or dual 4K@30Hz depending on the host output and display capabilities.

Which systems are explicitly compatible?
Answer. It is compatible with many Windows systems and specific Microsoft Surface models such as Surface Pro 4, Pro 5th Gen and Pro 6; older Surface Pro 3 and earlier are not supported.