Satechi USB4 Multiport Adapter Review 2026 - Specs, Pros & Cons

Name: Satechi USB4 Multiport Adapter with 8K HDMI
Brand: Satechi
SKU: ST-U4MA3M

The Satechi USB4 Multiport Adapter is a compact 9-in-1 hub for laptops that need one HDMI output, wired networking, card readers, and legacy USB-A ports without carrying a full desk dock. Its USB4 host connection can move data at up to 40 Gbps when the laptop supports USB4, and it remains compatible with Thunderbolt 3 and older USB-C connections. The headline feature is HDMI output up to 8K at 30Hz. That mode needs a compatible computer, cable, monitor, and a direct HDMI connection. Mac computers are limited to 4K at 60Hz through this adapter. Alongside video, Satechi includes two 10 Gbps USB-A ports, one USB 2.0 USB-A port for a keyboard or mouse, Gigabit Ethernet, SD and microSD readers, and a 3.5 mm audio jack. A USB-C PD input accepts up to 100W, but the adapter uses about 15W itself, so the connected laptop can receive up to roughly 85W. The USB-C port is only for power input, not data or a display. This is a well specified portable hub for a single-monitor setup, although its $149.99 retail positioning is harder to justify now that many newer USB-C hubs offer similar everyday ports for less.

Pros & Cons

What We Like

USB4 host link supports up to 40 Gbps and remains backward compatible with Thunderbolt 3 and USB-C
Two USB-A ports support up to 10 Gbps for faster external drives
Includes Gigabit Ethernet, SD and microSD readers, and a 3.5 mm audio jack in a compact hub
HDMI supports up to 8K at 30Hz with compatible hardware
Satechi backs the adapter with a two-year limited warranty

What Could Be Better

Only one external display is supported through HDMI
Workaround: Choose a dual-display dock if you need two external monitors.
Mac output is limited to 4K at 60Hz rather than 8K
Workaround: Use a Mac-compatible 4K display or choose a dock with a display configuration that matches your Mac and monitor setup.
The USB-C PD port accepts power only and cannot connect USB-C storage or a monitor
Workaround: Connect data devices through the USB-A ports or choose a hub with a dedicated USB-C data port.
Card readers are UHS-I, not UHS-II
Workaround: Use a dedicated UHS-II reader if fast photo or video transfers are a priority.
Amazon US listing was unavailable during this review
Workaround: Check Satechi or an authorized retailer for current availability and pricing.

Display Support

Max Displays: 1

1 display (Up to 8K at 30Hz through HDMI with a compatible host, cable, and monitor. Requires a direct HDMI connection.)

7680x4320 @ 30Hz

1 display (macOS supports up to 4K at 60Hz through this adapter.)

3840x2160 @ 60Hz

Ports & Connectivity

USB Ports

2x USB-A 3.2

1x USB-A 2.0

Video Outputs

1x HDMI

Network

1x Ethernet (1 Gbps)

Audio

1x 3.5mm combo

Card Readers

1x SD (SD 3.0 / UHS-I, up to 104 MB/s)

1x microSD (SD 3.0 / UHS-I, up to 104 MB/s)

Full Specifications

General
Manufacturer	Satechi
Model	ST-U4MA3M
Release Date	2022-12
Connectivity
Host Connection	USB-C
Max Data Rate	40 Gbps
Driver Required	No (native)
Display Output
Max Displays	1
1x Display	7680x4320 @ 30Hz (Up to 8K at 30Hz through HDMI with a compatible host, cable, and monitor. Requires a direct HDMI connection.)
1x Display	3840x2160 @ 60Hz (macOS supports up to 4K at 60Hz through this adapter.)
Ports (4+ total)
USB-A 3.2	2x
USB-A 2.0	1x
HDMI	1x
Ethernet (RJ45)	1x 1 Gbps
Audio (3.5mm-combo)	1x
SD Card Reader	1x
microSD Card Reader	1x
Power
Power Input	USB-C
Laptop Charging	Up to 85W

Compatibility

Windows

Supports compatible USB-C, Thunderbolt 3, and USB4 Windows laptops. HDMI requires DisplayPort Alt Mode.

macOS

Compatible with supported Mac computers. HDMI output is limited to 4K at 60Hz.

Known Issues

USB-C hosts without DisplayPort Alt Mode

No HDMI video output

Mac computers seeking 8K output

8K mode is unavailable

USB-C data peripherals connected to the PD port

No data connection

7.4 /10

Our Verdict

Very Good

The Satechi USB4 Multiport Adapter makes sense for someone who specifically wants USB4 bandwidth in a small hub and still relies on USB-A peripherals, Ethernet, and camera cards. It has a better port mix than a basic travel dongle, and the two 10 Gbps USB-A ports are useful for fast external storage. The 8K label needs some context. It is a single HDMI output at 8K and 30Hz, while Macs top out at 4K and 60Hz. It is not a dual-monitor dock, and the card readers run at UHS-I speeds rather than the faster UHS-II standard. Satechi's own documentation also makes clear that the power input is not a general-purpose USB-C data port. Amazon's US listing was unavailable during this review, though the listing still showed a 4.2 out of 5 rating from 91 reviews. One Reddit owner reported an ultrawide display intermittently turning off, which is not enough evidence to call it a widespread fault, but it is a reason to test the hub promptly with a demanding monitor. If you need a compact single-display hub and value 40 Gbps USB4 compatibility, this is a capable option. If you need two displays, faster card transfers, or a lower price, a newer dock or a dedicated card reader is the better fit.

Frequently Asked Questions

Does the Satechi USB4 Multiport Adapter support 8K HDMI?

Yes, the ST-U4MA3M supports one HDMI display up to 8K at 30Hz when the computer, HDMI cable, and monitor support that mode. Satechi says the 8K setup needs a direct HDMI connection. On macOS, output is limited to 4K at 60Hz.

How much laptop charging does the Satechi USB4 Multiport Adapter provide?

The USB-C PD input accepts up to 100W. Satechi says the adapter uses about 15W for operation, leaving up to roughly 85W for the connected laptop. The exact charging rate also depends on the charger and laptop.

Can I connect a USB-C monitor to this Satechi adapter?

No. The USB-C port is for power input only. It does not carry USB data or video. The adapter has one HDMI display output.

Does this hub work with a MacBook?

Satechi lists supported Mac computers, and the adapter works with compatible USB-C, Thunderbolt 3, and USB4 hosts. The important video limit is that Macs support up to 4K at 60Hz through this adapter, not 8K.

Are the card readers UHS-II?

No. The SD and microSD readers support SD 3.0 UHS-I media, with a stated maximum transfer speed of 104 MB/s and capacities up to 2TB.