--- title: Comma.ai Launches A PCIe Gen4 x4 To USB4 Dock With... description: Comma.ai and Tinygrad's George Hotz announced the Chestnut, a PCIe Gen4 x4 to USB4 dock with open-source firmware, designed to let their driver-assistance... canonical: https://daily.dev/posts/comma-ai-launches-a-pcie-gen4-x4-to-usb4-dock-with-open-source-firmware-gvihv3ztx twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Comma.ai Launches A PCIe Gen4 x4 To USB4 Dock With Open-Source Firmware | daily.dev og:description: Comma.ai and Tinygrad's George Hotz announced the Chestnut, a PCIe Gen4 x4 to USB4 dock with open-source firmware, designed to let their driver-assistance... og:url: https://daily.dev/posts/comma-ai-launches-a-pcie-gen4-x4-to-usb4-dock-with-open-source-firmware-gvihv3ztx og:image: https://api.daily.dev/og/posts/gviHv3ZTX.png og:image:alt: Comma.ai Launches A PCIe Gen4 x4 To USB4 Dock With Open-Source Firmware og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Comma.ai Launches A PCIe Gen4 x4 To USB4 Dock With Open-Source Firmware **[Phoronix](https://daily.dev/sources/phoronix)** · 2 min read · 0 upvotes · 0 comments ## Summary Comma.ai and Tinygrad's George Hotz announced the Chestnut, a PCIe Gen4 x4 to USB4 dock with open-source firmware, designed to let their driver-assistance systems use larger compute (up to 100W) via GPUs like the AMD Radeon RX 9060, rather than being limited to a 10W footprint. The launch coincides with a new 1B parameter driving model arriving in the upcoming OpenPilot 0.11.2. The dock also works as a general-purpose eGPU enclosure for any PC, not just Comma.ai hardware, and runs on open-source C firmware for the ASM2464PD USB4/Thunderbolt-to-NVMe bridge controller, published on GitHub. The Tiny Chestnut dock alone costs $249, while the version bundled with a Radeon RX 9060 costs $799. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### What is the Comma.ai Chestnut dock and why did they build it? The Chestnut is a PCIe Gen4 x4 to USB4 dock with open-source firmware, launched by Comma.ai and Tinygrad's George Hotz to let driver-assistance systems run larger models. It expands the compute power budget from 10 Watts to up to 100 Watts, enabling use of GPUs like the AMD Radeon RX 9060 mounted under a car seat or in the passenger footwell. _Engineers weighing eGPU and edge-compute options for embedded AI can track hardware releases like this on daily.dev._ ### How much does the Comma.ai Chestnut eGPU dock cost? The Tiny Chestnut eGPU Dock alone retails for $249 USD, while the Chestnut bundled with an AMD Radeon RX 9060 8GB GPU costs $799 USD. Both are sold directly through Comma.ai's shop and can be used with a typical PC, not just Comma.ai's driving systems. _Buyers comparing eGPU dock pricing and specs can follow hardware launches like this on daily.dev._ ### Is the firmware for the Comma.ai Chestnut USB4 dock open source? Yes, the Chestnut runs open-source C-based firmware for the ASM2464PD USB4/Thunderbolt to NVMe bridge controller, published on GitHub under the tinygrad organization. This makes the dock usable beyond Comma.ai's own driver-assistance hardware, including with standard PCs and Tinygrad workloads. _Developers exploring open firmware projects can keep tabs on releases like this via daily.dev._ ## Similar posts on daily.dev - [Baseus’ new desktop dock includes a Qi2 25W charger](https://daily.dev/posts/baseus-new-desktop-dock-includes-a-qi2-25w-charger-1fdsebkmb) · The Verge · 0 upvotes · 0 comments - [AMD Instinct MI350P: PCIe Add-In Card For High Performance Open-Source AI/Compute Review](https://daily.dev/posts/amd-instinct-mi350p-pcie-add-in-card-for-high-performance-open-source-ai-compute-review-xfswkkdb0) · Phoronix · 0 upvotes · 0 comments - [A $30 USB-C dock turned my handheld into the living room PC I actually wanted](https://daily.dev/posts/a-30-usb-c-dock-turned-my-handheld-into-the-living-room-pc-i-actually-wanted-khd34r4ty) · XDA Developers · 0 upvotes · 0 comments --- [View this post on daily.dev](https://daily.dev/posts/comma-ai-launches-a-pcie-gen4-x4-to-usb4-dock-with-open-source-firmware-gvihv3ztx) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Comma.ai Launches A PCIe Gen4 x4 To USB4 Dock With Open-Source Firmware","url":"https://daily.dev/posts/comma-ai-launches-a-pcie-gen4-x4-to-usb4-dock-with-open-source-firmware-gvihv3ztx","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/comma-ai-launches-a-pcie-gen4-x4-to-usb4-dock-with-open-source-firmware-gvihv3ztx"},"datePublished":"2026-08-13T00:43:06.107Z","dateModified":"2026-08-13T00:43:31.793Z","description":"Comma.ai and Tinygrad's George Hotz announced the Chestnut, a PCIe Gen4 x4 to USB4 dock with open-source firmware, designed to let their driver-assistance...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/afe8b8b5bf0fb7b29a6ca80e8da35643?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/afe8b8b5bf0fb7b29a6ca80e8da35643?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"Phoronix","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"Phoronix","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/6a26ba379dd64932830aa0c9803dd7ee","url":"https://daily.dev/sources/phoronix"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/comma-ai-launches-a-pcie-gen4-x4-to-usb4-dock-with-open-source-firmware-gvihv3ztx","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"","timeRequired":"PT2M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Phoronix","item":"https://daily.dev/sources/phoronix"},{"@type":"ListItem","position":3,"name":"Comma.ai Launches A PCIe Gen4 x4 To USB4 Dock With Open-Source Firmware"}]} {"@context":"https://schema.org","@type":"FAQPage","@id":"https://daily.dev/posts/comma-ai-launches-a-pcie-gen4-x4-to-usb4-dock-with-open-source-firmware-gvihv3ztx#faq","mainEntity":[{"@type":"Question","name":"What is the Comma.ai Chestnut dock and why did they build it?","acceptedAnswer":{"@type":"Answer","text":"The Chestnut is a PCIe Gen4 x4 to USB4 dock with open-source firmware, launched by Comma.ai and Tinygrad's George Hotz to let driver-assistance systems run larger models. It expands the compute power budget from 10 Watts to up to 100 Watts, enabling use of GPUs like the AMD Radeon RX 9060 mounted under a car seat or in the passenger footwell. Engineers weighing eGPU and edge-compute options for embedded AI can track hardware releases like this on daily.dev."}},{"@type":"Question","name":"How much does the Comma.ai Chestnut eGPU dock cost?","acceptedAnswer":{"@type":"Answer","text":"The Tiny Chestnut eGPU Dock alone retails for $249 USD, while the Chestnut bundled with an AMD Radeon RX 9060 8GB GPU costs $799 USD. Both are sold directly through Comma.ai's shop and can be used with a typical PC, not just Comma.ai's driving systems. 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