it doesn't work either, the fans turn to 100%, so i bought another product.
phobya 4pin pwm 6x4pin splitter e.g. at
http://www.aquatuning.de/luftkuehlu...
You need a mainboard that outputs a fan control signal (PWM or voltage control), the controller does not have its own control or sensors. Does your Mac have such a connector (4-pin)?