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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
18.04.2015 - modding.fr NH-L9x65
Test verdict: "Le NH-L9x65 est un ventirad « taillé » pour les mini boîtiers, les HTPC et toute sorte de boitier où la place est comptée." (Bertrand Curras, modding.fr)
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17.04.2015 - CoolingTechnique.com NH-L9x65
Test verdict: "Tirare delle conclusioni su questo genere di proposte non è mai semplice, se però si analizzano le premesse con il quale l'NH-L9x65 viene venduto possiamo sicuramente direi che il bersaglio è stato nuovamente centrato da parte di Noctua." (Damiano Villa, CoolingTechnique.com)
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17.04.2015 - OverclockersClub.com NH-U9S
Test verdict: "Noctua is in a great place market wise, because of good performance and quality fans. Any users who either do not have the internal retail space or is looking for lower temperatures versus using the stock cooler. This is what this cooler is intended for. It may be a little pricey for my taste, but you get a lot for what you pay." (Isaiah Rossiter, OverclockersClub.com)
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17.04.2015 - El Chapuzas Informático NH-L9x65
Test verdict: "El Noctua NH-L9x65 es quizás uno de los mejores disipadores ultra-compactos que podemos encontrar en el mercado, pues con su altura de tan solo 65 mm permite ser instalado en chasis realmente muy muy bajos. (Iván Martínez, El Chapuzas Informático)
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