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[ARTICLE · art-94902] src=comma.ai ↗ pub= topic=ai-infrastructure verified=true sentiment=· neutral

Comma.ai Launches a PCIe Gen4 X4 to USB4 Dock with Open-Source Firmware

Comma.ai launched chestnut, a PCIe Gen4 X4 to USB4 dock with open-source firmware, enabling GPU access over USB connections and macOS support via TinyGPU. The dock allows users to connect to a computer as a standard USB4 dock or use tinygrad for USB3/USB2 GPU access.

read1 min views1 publishedAug 13, 2026
Comma.ai Launches a PCIe Gen4 X4 to USB4 Dock with Open-Source Firmware
Image: source

With a PC

USB4

Connect chestnut to your computer and use it like any other USB4 dock.

USB3 or USB2

Use tinygrad to access the GPU over a USB3 or USB2 connection.

Mac

Follow the TinyGPU setup guide to use a supported GPU on macOS.

Join the #gpu-on-usb channel on the tinygrad Discord.

source & further reading
comma.ai — original article
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