USB 3.0 to Dual HDMI Adapter for 2 Monitors - 4K/1080P Video Splitter

In this review of the USB 3.0 to Dual HDMI Adapter, the bottom line is simple: it is a practical, budget-friendly way to add two external displays when a device lacks native video output. The adapter is aimed at laptop and PC users who need extra screen real estate for multitasking, streaming, or presentations, and it stands out because it supports one 4K@30Hz port plus a second 1080P@60Hz port while running on the SiliconMotion SM768 chip. For Mac and Windows users willing to install the required driver, it reliably expands desktop space without replacing hardware.

Key Features

• Compatibility: Works with both Mac OS and Windows systems when the SiliconMotion driver is installed, enabling video output from USB 3.0 ports that do not natively support display signals.
• Dual-display modes: Supports mirror and multiple extended modes, including A-A-A mirror and extended A-B-B and A-B-C layouts, which give flexible multi-monitor arrangements on supported systems.
• High resolution: Port 1 supports up to 4K@30Hz while Port 2 supports up to 1080P@60Hz, allowing one high-resolution screen plus a smooth full HD secondary display for productivity.
• SM768 chipset: Built around the SiliconMotion SM768 chip, the adapter is designed to handle USB 3.0 data throughput and offload video processing for extra displays.
• Driver installation: The adapter requires the SiliconMotion driver to enable plug-and-play functionality, and the installation process is guided in the included instructions.

Who It's For

This adapter is ideal for laptop users, office workers, and home multitaskers who need two additional screens but either have only USB ports or prefer a simple external solution to avoid docking stations. It is particularly useful when one wants a 4K main display alongside a 1080P secondary monitor for reference windows, chat apps, or video playback.

It is less suitable for users who need 4K at 60Hz, ultra-low latency for competitive gaming, or those unwilling to install third-party drivers. People using very old USB 2.0 ports should look for alternatives that explicitly support lower USB standards.

Pros & Cons

Pros

• Enables two extra displays from a single USB 3.0 port, expanding screen space without internal upgrades.
• Supports one 4K@30Hz output plus a 1080P@60Hz output for a balanced blend of resolution and refresh.
• The SiliconMotion SM768 chipset provides stable video extension and supports multiple extended modes on Mac and Windows.
• Clear driver installation path makes plug-and-play possible after setup.

Cons

• Requires installing the SiliconMotion driver and occasional macOS permissions prompts, which some users may find inconvenient.
• 4K output is limited to 30Hz on the primary port, so it is not ideal for high-frame-rate video or gaming.

Specifications

Brand	Loryi
Interface	USB 3.0
Chipset	SiliconMotion SM768
Port resolutions	Port 1: 4K@30Hz; Port 2: 1080P@60Hz
Display modes	Mirror (A-A-A) and Extended (A-B-B, A-B-C)
OS support	Mac OS and Windows (SiliconMotion driver required)

Our Verdict

The USB 3.0 to Dual HDMI Adapter is a sensible value for users who need to add two external monitors without changing their laptop or buying a full dock; it delivers one 4K and one 1080P output through the SM768 chipset and supports useful extended modes for Mac and Windows. For everyday productivity, presentations, and expanded screen workflows it hits the right balance of cost and capability, provided the driver installation is acceptable to the user.

Frequently Asked Questions

Does this adapter work without drivers?
Answer: No, the SiliconMotion driver must be installed for full functionality; after installation it supports plug-and-play operation.

What resolutions are supported on each HDMI port?
Answer: Port 1 supports up to 4K@30Hz and Port 2 supports up to 1080P@60Hz.

Will it extend the desktop on Mac?
Answer: Yes, it lifts Mac OS video extension limits and can unlock ABC extension mode once the required driver and permissions are granted.