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 Wide
Raspberry Pi Camera Module 3
reComputer J202 – Dev Kit carrier Board for Jetson Nano/Xavier
Official Raspberry Pi Debug Probe
Beagleplay Board, AM6254, WL1807, CC1352P74T0RGZR, ARM Cortex-A53, Cortex-M4
RP2040 Microcontroller IC by Raspberry PI-REEL of 100 



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