@birdulon >It's possible that also uses a generic MCU to handle the PWM signal input to brushless speed control, easier for them to tweak the behaviour that way after all.
I believe the wiring is directly connected to an electric motor as PWM on/off pulses are very good at controlling of the speed of a motor.

It's up to the PWM controller on the motherboard to control the speed of the motor pretty much (it really doesn't matter if the fan is a few dozen RPM off).


Of course, you can get RGB CPU coolers that run proprietary software.