The
Raspberry Pi 3 B+ was designed to run without a heatsink or
fan. The processor and operating system use clock speed throttling to keep temperatures within a safe operating range and should the temps rise beyond normal, the CPU will be throttled from 1.4GHz down to 1.2GHz.
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The fan can be connected to the 3.3V or to the 5V pin of the GPIO pins.Mar 30, 2020
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Plug the fan directly into your Raspberry Pi's 5V+GND GPIO power pins, as shown, for instant cooling! Place in your case, or even better, on top of your Pi's CPU to give it extra air-flow.
