There are several PWM controlled cooling fans avaliable for the Raspberry Pis prior to the Pi 5, that are connected via the Pi's GPIO header. Examples are the Argon mini-fan, HighPi Pro Fan or ...
1: What is Raspberry Pi Compute Module 5? The CM5 is a computer for industrial and embedded applications equipped with a processing chip equivalent to the Raspberry Pi 5. The CM5 does not have input ...