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Nine Blade Design
The pressure-optimized Nine Blade Design of the NF-P12 (P stands for pressure, power and performance) has been specifically developed for high-impedance applications such as CPU coolers, water-cooling radiators, power supplies or cases with restrictive fan grills. It achieves outstanding static pressure and high airflow at very low noise levels.

While most conventional 120mm rotors possess seven comparably narrow fan blades, the NF-P12's Nine-Blade Design uses nine large, closely spaced blades with a relatively low angle of attack in order to achieve maximum static pressure and high airflow. As a result, the NF-P12 provides no less than 1.68 mm H2O at 1300 rpm, which is something that other fans merely achieve at 1600 rpm or more.

Nine Blade Design


As a matter of principle, increasing the number of blades involves the risk of increasing the aerodynamic noise in general and noises caused by rotor-stator interaction in particular. Basically, an increase in static pressure usually brings about higher noise emissions. In the case of the NF-P12, this problem is dealt with by adding Vortex-Control Notches to the blades' trailing edges. Due to the two notches at the trailing edge, the flows along the suction and pressure side mix more smoothly. This allows for less turbulence and velocity loss, which leads to a significant reduction in noise emission as well as increased efficiency. In order to achieve the smoothest possible transition and maximum noise reduction, the Vortex-Control Notches are rounded in shape.

Nine Blade Design


In addition to optimizing the joining of the flows at the trailing edge, the Vortex-Control Notches fulfil the task of psychoacoustic optimization: Due to the Vortex-Control Notches, trailing edge vortices are split up into several smaller vortices. Thus the noise is spread over a wider range of frequencies and therefore perceived as much less annoying.

Nine Blade Design


The Vortex-Control Notches' effect of psychoacoustic optimization is further enhanced by the staggering of the notches. The Vortex-Control Notches are staggered from blade to blade so that each blade creates a different vortex pattern. As a result, the fan's noise emission is better spread over the frequency spectrum and thereby makes it yet more pleasant to the human ear.

Nine Blade Design


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Noctua
30.05.2015 - QWERTYmag.it NH-C14S
Test verdict: "In sostanza si tratta di un ottimo dissipatore, estremamente versatile e valido, ideale per le configurazioni compatte che però non vogliono rinunciare alle performance dei dissipatori high-end. Se tuttavia aveste bisogno di maggiore potenza dissipante, potrete installare una seconda ventola così da avere in soli 142mm di altezza un sistema dual fans da 14cm, cosa si può volere di più?" (Davide Torno, QWERTYmag.it)
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29.05.2015 - TecnoGaming.com NH-D9L
Test verdict: "Noctua es sinónimo de calidad y rendimiento y queda demostrado en nuestro banco de pruebas. En esta ocasión el modelo NH-D9L apunta específicamente a un segmento donde se necesita que un cooler se acople en espacios pequeños como pueden ser un HTPC compacto. Dado que la altura del cooler no supera los 110 mm (con ventilador incluido) resulta ideal para este tipo de configuraciones. Además brinda un excelente rendimiento manteniendo temperaturas óptimas y a su vez gracias a su ventilador PWM obtenemos silencio en la mayoría del uso de la PC." (Alejandro Dau, TecnoGaming.com)
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29.05.2015 - Dark Tech Reviews NH-U9S
Test verdict: "اذا كنت تبحث عن تبريد جيد للمعالج الخاص بك وبحجم صغير جداً فهذه المشتتات موجهة لك " (Ahmed Mohamed, Dark Tech Reviews)
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29.05.2015 - PC Media 05/2015 NH-L9x65
Test verdict: "Dibanding dengan stock cooler, kami merekomendasikan NH-L9x65 untuk beberapa penilaian. Bagi user mini-ITX yang ingin membangun sistem HTPC, dan tak ingin mengalami masalah kebisingan, kami menyarankan NH-L9x65 ini. Kompatibilitas nya terhadap komponen lain cukup mendukung layout motherboard mini-ITX." (Agus Prasetyo, PC Media 05/2015)
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