Too loud for me in the living room cabinet for Fritzboxkühlung

Have shipped in the living room-base with relatively poor ventilation my Fritz box and cable modem.
Since the Fritz box is quite warm, I put them on the X-SLIM II.
Unfortunately, he (and another, I also tested, so therefore not defective) a "Klackergeräusch", the fan makes a total quite noisy, which actually does not have to be.
Become now a more expensive Coolermaster bring with fan control. (This did not - and I would have passed fewer revolutions!)