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Gray USB-C to HDMI 2.1 adapter, compact form factor, matte finish

Cable Matters 201488 USB-C to HDMI 2.1 Adapter 48Gbps 8K60 4K240 Gray

SKU CH-17B4-RE6XW

Connects USB-C devices to HDMI 2.1 displays at up to 8K 60 Hz or 4K 240 Hz with 48 Gbps bandwidth

  • ColorGray
  • Weight0.03 kilograms
  • Package Quantity1
  • Supports 8K at 60Hz for ultra-high-definition viewing
  • Delivers 4K at 240Hz for smooth high-refresh gaming
  • Works with Thunderbolt 3 and 4 ports for broad compatibility
  • Optimised firmware enables 4K 120Hz on Apple M1 through M3 chips
  • No firmware update required for immediate plug-and-play use

USB-C to HDMI 2.1 adapter for Mac and PC

This Cable Matters 201488 adapter connects USB-C devices to HDMI 2.1 displays at up to 48Gbps bandwidth. It supports 8K resolution at 60Hz and 4K at 240Hz for compatible Macs with M1 through M4 chips and Windows PCs with qualifying graphics. The gray unidirectional dongle weighs 0.03 kilograms and requires no firmware updates for basic operation.

Plug-and-play install with host-side requirements

Installation is straightforward: connect the USB-C end to a Thunderbolt 3, Thunderbolt 4 or USB4 port and the HDMI end to the display. On Windows, achieving 8K at 60Hz demands an 11th or 12th generation Intel CPU with Iris Xe graphics, an Nvidia RTX 2060 or 3060, or an AMD Radeon RX 6000 series GPU. Some 8K televisions need a manual firmware update and manual resolution selection before the highest modes appear.

Sustained high-refresh output without active cooling

The adapter maintains 4K at 240Hz or 8K at 60Hz continuously because it draws power from the host port and uses passive signal conversion. No fan or external supply is present, so thermal throttling is not a factor during long gaming or editing sessions. Performance stays consistent as long as the source device sustains the required video bandwidth and the display keeps its link trained.

Highlights

  • Supports 8K at 60Hz for ultra-high-definition viewing
  • Delivers 4K at 240Hz for smooth high-refresh gaming
  • Works with Thunderbolt 3 and 4 ports for broad compatibility
  • Optimised firmware enables 4K 120Hz on Apple M1 through M3 chips
  • No firmware update required for immediate plug-and-play use

Specifications

BrandCable Matters
Model201488
Part Number201488
ColorGray
Weight0.03 kilograms
Package Quantity1

Questions about this item

How can I confirm the adapter is delivering 8K at 60 Hz on my Mac?

Open System Settings, choose Displays, and verify the external monitor shows 8K at 60 Hz with RGB 4:4:4 selected.

What comes in the package and what extra cables are needed?

The box contains one gray adapter weighing 0.03 kilograms; you must supply a USB-C cable from the host and an HDMI 2.1 cable to the display.

Which Mac chip should I have to reach 4K 240 Hz?

M3 Pro, M3 Max, M4 or M4 Pro/Max chips support 4K at 240 Hz; M1, M1 Pro/Max, M2, M2 Pro/Max and M3 chips support 4K at 120 Hz.

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