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This User Manual covers setup, features, compatibility, and specifications for the Satechi USB-C to HDMI 2.1 8K Adapter (ST-AC8KHM).

What's In The Box

USB-C to HDMI 2.1 8K Adapter, User Manual.

Functions

1. USB-C Connector
2. Durable Braided Cable
3. HDMI 2.1 Port

Product Overview

The USB-C to HDMI 2.1 8K Adapter adds a full-size HDMI 2.1 output to a USB-C or Thunderbolt device, so you can drive a monitor or TV at up to 8K at 60Hz, or at 4K up to 144Hz for high refresh rate gaming. It is plug and play and needs no power of its own.

Setup

The USB-C to HDMI 2.1 8K Adapter is plug and play, no drivers or software required. An HDMI cable is not included.

1. Connect USB-C cable to your device: Plug the adapter's USB-C connector into a USB-C or Thunderbolt port on your laptop, tablet or phone.

2. Plug your HDMI cable into the adapter's port: Connect an HDMI cable between the adapter's HDMI 2.1 port and your display, monitor or television. An HDMI 2.1 cable is recommended for full 8K output.
3. Switch the input to HDMI and start streaming: Select the matching HDMI input on your display.

Ports and Features

Parts labeled diagram of the USB-C to HDMI 2.1 8K Adapter with 3 labeled components.

1. USB-C Connector: Plugs into the USB-C or Thunderbolt port on your host device. The port must support DP Alt Mode, otherwise no video is sent.
2. Durable Braided Cable: The short braided cable that joins the USB-C connector to the adapter body. The braided sleeve is there for durability where the cable flexes.
3. HDMI 2.1 Port: Full-size HDMI 2.1 output, up to 8K at 60Hz. 8K output is not supported on macOS. An HDMI cable is not included and an HDMI 2.1 cable is recommended for 8K.

Features

- HDMI 2.1 output up to 8K at 60Hz
- 4K at 60Hz, 120Hz or 144Hz for high refresh rate displays
- 1080p at up to 500Hz
- Backwards compatible with HDMI 1.4 and up
- Bus powered, no external power adapter needed
- Braided cable for strain relief

Important Limitations

8K video output currently not supported on macOS. iPadOS and iOS do not support 8K output either.

Host device must support DP Alt Mode over USB-C. Without DP Alt Mode on the USB-C port the adapter cannot send video. Thunderbolt 3, Thunderbolt 4, USB4 and USB-C 3.2 Gen 2 host ports are supported.

Some monitors will require settings to be adjusted when attempting to output 8K resolution. On 8K TVs you may need to switch 8K on in the display's own settings. Check your television user manual for how to enable it.

An HDMI cable is not included. An HDMI 2.1 cable is recommended for optimal functionality. The adapter is backwards compatible with HDMI 1.4 and up.

Specifications

Model: ST-AC8KHM
Connector: USB-C
Supported Resolutions: 8K/60Hz, 4K/60Hz, 4K/120Hz, 4K/144Hz, 1080p/500Hz
Ports & Speeds:
1x USB-C connector: DP Alt Mode over USB-C required on the host device
1x HDMI 2.1 port: up to 8K at 60Hz

Certifications

FCC, CE, WEEE, ICES-3 / NMB-3 (Canada)