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Smooth Commutation Drive

Next to aerodynamic noise and bearing related noises, the so called "commutation noise" or "switching noise" can play a major role in the noise emission of axial fans with brushless DC motors. At each transition from one stator coil to another, the rotor receives a sudden torque pulse when the next coil switches on. Each of these torque pulses causes a minute deformation of the whole fan structure. Depending on rpm, torque and the material of the fan, this can result in noticeable noises.

Noctua's Smooth Commutation Drive system provides more continuous switching in order to achieve a smoother transition between the stator coils and thereby significantly contributes to the fan's overall quietness. The second generation of this technology (SCD2) further improves running smoothness and reduces minute noises in close proximity to the motor.


Noctua
02.09.2015 - OverclockersClub.com NH-L9x65
Test verdict: "Are you looking to build a small system based on an ITX motherboard? With a six-year warranty, the NH-L9x65 retails for $59.99 and would be right at home in your HTPC build." (Chris Dawalt, OverclockersClub.com)
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01.09.2015 - WhatNext.pl NH-D15S
Test verdict: "Oczywiście cooler posiada wszystko to co wersja NH-D15 – znakomitą jakość wykonania, stosunkowe ciche działanie na niższych obrotach, świetne akcesoria i dobrą wydajność. Dlatego też, jeśli starszy model NH-D15 jest zbyt szeroki i nie zamontujecie dwóch śmigieł to polecam zakup tej wersji." (Michał Andruszkiewicz, WhatNext.pl)
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01.09.2015 - Neoseeker.com NH-C14S
Test verdict: "With the availability of past and future mounting kit options from Noctua, a 6 year warranty and several fan configuration options, the NH-C14S cooler proves an exceptional design that will help your computer system operate with ideal thermal performance." (Marvin Purdy, Neoseeker.com)
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01.09.2015 - ITPC.net.pl NH-U14S
Test verdict: "Mogę z czystym sumieniem polecić każdemu chłodzenia tej firmy, gdyż wyróżniają się wysoką wydajnością i idealną wręcz jakością wykonania. Ewidentnie jest to wzór do naśladowania." (Karol Kaszubowski, ITPC.net.pl)
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