.... With a good price / Leistungsverhältnis.2 this 140mm case fan their laps on my Cpu Kühler.Ich use an Asus motherboard with the new Socket 1150 which brings its own fan controller, so can a 3-pin fan werden.Bei controlled me is about min. Speed of 450U / min and max approx. Speed of 1020U / min möglich.Ich they do not hear from my system heraus.An the processing can not be faulted. If you have questions write me.