Who this is for
StarPilot users wondering whether to buy chestnut.
comma fourcomma 3Xcomma three
StarPilotHardware and wiringSome effort
Chestnut with StarPilot on comma 3, 3X and four
You only need chestnut for the biggest models; StarPilot detects it at boot and hides GPU models when it is missing.
You need
- A comma device running StarPilot
- A chestnut kit from comma
- 12 V power and a place for the GPU box
In plain words
Why this guide matters
StarPilot owners keep asking whether comma's chestnut GPU box is worth buying. This page explains that only models marked as needing a GPU require it, and the fork hides those models when chestnut is absent. You learn what changes at boot, which kit to buy, and how to pick a GPU model afterwards.
The short version
What the full guide walks you through
Decide whether you want models marked as needing a GPU.
Buy the dock-only or ready-to-drive kit.
Mount the box and connect power and USB.
Pick a GPU model in the model manager once detected.
Before you start
- StarPilot claims comma 3 and 3X support; comma itself only supports chestnut on comma four.
The full written guide belongs to StarPilot. Checked on September 10, 2026.
Quick answers
Questions people ask
Does StarPilot support chestnut on a comma 3X?
StarPilot's wiki says yes for comma three, 3X and four, but comma only supports the comma four. Treat older-device use as unverified.
What happens if I unplug chestnut?
StarPilot checks for chestnut at boot and falls back to a built-in model if your chosen model needs a GPU.
Which model should I start with?
The wiki suggests a standard on-device model first. Try a chestnut-class model only after the basics work.
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Photos: comma.ai. Guide content belongs to StarPilot. CommaGuide is an independent guide and is not affiliated with comma.ai or StarPilot.
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