Our Raspberry Pi 400 teardown reveals a large heat spreader for cooling, and a custom-designed motherboard with all RPi4 components.
Buy a Raspberry Pi 400 unit – Raspberry Pi
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Buy a Raspberry Pi 400 Personal Computer Kit – Raspberry Pi
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The Raspberry Pi 400 - Teardown and Review
The Raspberry Pi 400 - Teardown and Review
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Buy a Raspberry Pi 400 Personal Computer Kit – Raspberry Pi