A heat sink is a component that increases the heat flow away from a hot device. It accomplishes this task by increasing the device’s working surface area and the amount of low-temperature fluid that moves across its enlarged surface area.
This is a dedicated aluminum heatsink designed specifically for the Raspberry Pi Compute Module 4 (CM4).
In testing, Waveshare found that the heatsink reduced temperatures by ~11°C vs the bare CM4 board (your mileage may vary depending on usage and local conditions).
Package Includes:
1 x CM4-HEATSINK Special for Raspberry Pi CM4
Raspberry Pi Camera Module 3
Raspberry Pi GPIO Multi-function Expansion Board for PI 4B/3B/3B+
Raspberry PIIQ Audio Codec Zero
Waveshare USB HUB HAT (B) for Raspberry Pi Series with 4x USB 2.0 Ports
Official Raspberry Pi 6 mm Wide Angle Lens for Pi High Quality Camera
Waveshare CAN bus Module (B) for Raspberry Pi Pico, enabling long range communication through SPI
Official Raspberry Pi Keyboard, Black/Grey
Waveshare Quad GPIO Expander for Raspberry Pi Pico 



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