Products | Technologies | Support | Press | Reviews | Where To Buy

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.

26.05.2015 - NF-A9 PWM
Test verdict: "Endnu en gang har Noctua leveret varen. De har modificeret og moderniseret en allerede god blæser til at blive om muligt endnu bedre. Denne blæser er blevet forbedret på flere områder, både når det gælder ydelse kontra støjforholdet, nyt og forbedret kugleleje og tilbehør. Alt i alt en rigtig god blæser, som flytter en masse luft uden at larme som en flyvemaskine." (Kim Monberg,

26.05.2015 - NF-F12 industrialPPC-3000 PWM
Test verdict: "Berbeda dengan produk Noctua yang biasanya memiliki fokus pada pendingin low-noise saja, NF-F12 industrial PPC-3000 PWM menawarkan solusi yang menarik bagi pengguna PC pencinta kesunyian dan overclocker penggemar high-performance fan." (Alva Jonathan,

26.05.2015 - NH-D9L
Test verdict: "[T]he NH-D9L is not only one of the tiniest CPU coolers one can find in the market but it's also very good at what it does and that's why it gets our Golden Award." (Nik Kastrantas,

26.05.2015 - NH-L9x65
Test verdict: "Noctua ha ancora una volta dimostrato la sua capacità nel creare un prodotto di altissima qualità, questa volta però in spazi contenutissimi. L'NH-L9x65 è incredibilmente piccolo e versatile nelle più svariate configurazioni e capace di dissipare per bene anche i processori più esigenti. Se state pensando ad una build che occupi davvero poco spazio e trovare un dissipatore ideale è stato un problema, l'NH-L9x65 potrebbe essere la vostra soluzione definitiva." (Marco Cremona,