Adafruit Official Raspberry Pi 4 Case Fan & Heatsink is compatible with the Raspberry Pi 4 and the Raspberry Pi 4 Case. It’s designed to push the performance of the Pi, and for overclocking. It keeps the Raspberry Pi 4 at a comfortable operating temperature even when under a heavy load. It has a mini heatsink that goes on top of the CPU and a fan that clips into the official Raspberry Pi 4 case.