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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
05.05.2015 - Noticias3D.com NH-L9x65
Test verdict: "Volvemos a tener una solución más que buena para nuestro ordenador de pequeño tamaño, PC de bajo consumo, HTPC o similar, y si viene de parte de Noctua, conocida por su buen hacer y eficiencia, pues más que una solución se trata de una recomendación. Excelente sistema de montaje, piezas de calidad, buen rendimiento para tratarse de un disipador de perfil bajo, compatibilidad con todos los sockets actuales, deja espacio para operar y para módulos de RAM altos, y todo ello por un precio aproximado de 45 euros, algo más caro que un disipador de perfil bajo convencional, pero ya sabemos que los precios de Noctua suelen despuntar un poco respecto a otras marcas." (Iván Aparicio, Noticias3D.com)
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05.05.2015 - TechnologyX.com NH-L9x65
Test verdict: "While pricing may be a little high, the overall package is well-worth it, if size is the number one concern. We’d have no problem recommending the Noctua NH-L9x65 to anyone in the market for a compact, low-profile and silent cooling solution." (Donny Stanley, TechnologyX.com)
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04.05.2015 - TechiCize.com NH-L9x65
Test verdict: "The NH-L9x65 is the perfect replacement for the Intel stock cooler, in a space limited case especially, this is the to one to go for!" (John Glenton, TechiCize.com)
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01.05.2015 - OverclockersClub.com NH-D9L
Test verdict: "Noctua has always been at the top of the game because of good performance and quality fans. In fact, the NH-D9L has managed to match the U9S benchmark temperatures in a even smaller form factor. That alone is an achievement in itself." (Isaiah Rossiter, OverclockersClub.com)
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