Raspberry Pi 4B needs active cooling in my opinion. This combination of three heatsinks and two fans does the trick. With the fans running at 20Β°C room temperature, my 4B runs between 28Β°C and 29Β°C under moderate loads. Small fans make some noise, as do small fans, but that's not a problem for my application. There are several solutions to cool the Raspberry Pi, but this expands the GPIO I need for my project. A built-in switch is used to turn the fans on/off and another switch to turn on/off some of the built-in LEDs.
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