Hi, I"ve been reading the info about 3 pin vs 4 pin fans and speed control and I think I have learned a lot, but I still have a little confusion.
My motherboard (ASUS P8H77-I) has 4 PIN header for the CPU with pins for PWM, IN, PWR, GND. So i get that this allows the mobo to control speed with PWM.
But the CHA fan header pins are +5V, IN, PWR, GND. Does this mean that the speed of a 4pin fan could be controlled by voltage regulation ? Are some 4pin fans PWM and some for voltage regulation ?
That is how your mb controls your fans, with voltage regulation. The fan is a simple DC motor, lower voltage it spins slower and higher voltage it spins faster.
Actually a PWM fan controls it with full voltage at a certain pulse. That being said yes you can control your fan with voltage. That is how most fan controllers work.