Cable Matters USB-C to Dual HDMI Adapter (8K / Dual 4K): Specs, Mac Limits & Alternatives (2026)
By The Workflow Guide
The Quick Answer
The Cable Matters Portable USB-C to Dual HDMI Adapter (model 201371) turns one USB-C or Thunderbolt port into two HDMI outputs: either two 4K monitors at 60Hz, or a single 8K monitor at 30Hz (or 4K at 120Hz). It folds up small for a laptop bag.
The catch: dual extended displays work on Windows and other systems that support MST. On a Mac, Cable Matters lists it as supporting one extended display — the second HDMI output mirrors the first.
Verdict: A compact, inexpensive way to run two monitors from a Windows laptop's single USB-C port. If you're on a MacBook and want two separate extended screens, this isn't the right adapter — look at a DisplayLink adapter instead (see Alternatives).
Key Specs
| Spec | Cable Matters USB-C to Dual HDMI (201371) |
|---|---|
| Input | USB-C (Thunderbolt 3/4 compatible) |
| Outputs | 2× HDMI |
| Single display | Up to 8K at 30Hz, or 4K at 120Hz |
| Dual display | Two 4K monitors at 60Hz |
| macOS | One extended display (the second output mirrors) |
| Video/audio features | HDR and Dolby Vision video; Dolby Atmos audio passthrough |
| Design | Foldable — the attached cable folds back into the body |
| Weight | About 0.04 kg |
Specs per the Amazon product listing (the product our link goes to), including Cable Matters' comparison table on that listing.
What Stands Out
Two monitors from one port. On a Windows laptop with a single spare USB-C/Thunderbolt port, this gives you two HDMI screens without a full dock.
High single-screen ceiling. If you only connect one display, it supports 8K at 30Hz or 4K at 120Hz — useful for a high-refresh 4K monitor.
Portable. The folding design and very low weight make it easy to leave in a laptop bag.
Trade-offs and Who Should Skip It
- Mac users: one extended display only. macOS doesn't support the MST technology this adapter uses for two independent screens, so the second monitor mirrors the first.
- Your laptop's port has to support video. The USB-C port must carry DisplayPort Alt Mode (Thunderbolt 3/4 ports do; some basic USB-C ports don't). Check your laptop's specs.
- No charging passthrough or extra ports. It's video only — if you also need to charge through the same port or add USB and Ethernet, a hub or dock is a better fit.
Alternatives
- Need two extended screens on a Mac? Cable Matters sells a separate DisplayLink USB-C to Dual HDMI adapter that supports two extended 4K displays on macOS and Windows (it requires installing a DisplayLink driver).
- Need charging and extra ports too? See our best USB-C hub & docking station guide.
The Workflow Guide publishes independent research and comparisons. We do not test products in-house; this page is based on the manufacturer's listings (linked above).
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Cable Matters Portable USB-C to Dual HDMI Adapter
Our pick, based on published specs and owner reviews — not hands-on testing.
Check Price on Amazon →Founder of The Workflow Guide — an IT professional who researches home-office gear and productivity software from specs, documentation and published reviews. Full bio →