Comma.ai has released 'Chestnut,' an eGPU dock for enhancing devices that add driver assistance features to cars using GPUs.
Introducing chestnut - comma.ai blog
https://blog.comma.ai/chestnut/
Comma.ai eGPU Dock Runs Open-Source Firmware: $249 Bare, $799 With an RX 9060 - Hardware Busters
https://hwbusters.com/news/comma-ai-egpu-dock-runs-open-source-firmware-249-bare-799-with-an-rx-9060/
Comma.ai sells products such as the 'comma two devkit,' which enables autonomous driving simply by installing it in a car. They released the next-generation model 'comma three' in 2021 and ' comma four ' in November 2025. These 'comma' series are in-car computers that operate autonomous driving systems by installing a camera-equipped display in the center of the windshield of vehicles equipped with 'cruise control' to maintain an appropriate distance from the vehicle in front and a 'lane departure prevention support system' that automatically adjusts the vehicle to stay in the center of the lane.
Comma.ai, a self-driving car startup founded by a genius hacker, has announced 'comma three,' a device that enables autonomous driving simply by attaching it to a car - GIGAZINE
The 'comma' series utilized 'openpilot,' an open-source autonomous driving system. While running openpilot's AI models on the in-vehicle computer previously kept the power consumption within a range of approximately 10W, the increasing size of the AI models led to insufficient computing power. Therefore, by using 'Chestnut,' a dock that connects an external eGPU to the in-vehicle PC, the comma four was equipped with a desktop GPU, increasing the power limit to approximately 100W.
The GPU should be mounted in the passenger footwell or under the passenger seat, out of the way. By routing the included cables to comma four and connecting them to the car's 12V power supply, you'll be ready to run large OpenPilot models.
The first driving model in the new Chestnut class series, 'openpilot 0.11.2,' boasts 30 times the number of parameters and 100 times the FLOPs, with further expansion potential. Comma.ai stated, 'Going forward, our autonomous development team will focus on maximizing the performance of the Chestnut class models, and we expect this new class of models to accelerate development.'
Comma.ai expects that the combination of comma four and Chestnut eGPUs will have computing power comparable to Tesla's in-car computing platform, 'HW4'.
The Chestnut is available as a dock-only 'tiny chestnut' for $249 (approximately 40,000 yen), and as a 'Chestnut “ready to drive”' which includes an AMD Radeon RX 9060 8GB, cables, and mounting hardware for $799 (approximately 130,000 yen), both from the Comma shop .
Additionally, the C language source code 'tinygrad,' which drives the Chestnut controller, is available on GitHub.
GitHub - tinygrad/asm2464pd-firmware: Firmware for the ASM2464PD · GitHub
https://github.com/tinygrad/asm2464pd-firmware/
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