The 3 pin fans can be controlled by a fan controller. 4 pin pwm can be controlled by the motherboard. It is npt ocuks fault that you did not check this id always buy a fan controller for a water cooled loop
I never said it was their fault i just said i was stuck with it till i can fix it and trying to stop other hitting the pitfall i ran into
(which you really shouldnt have to do with a new purchase)