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Noctua SSO-Bearing
Thanks to an optimised principle of operation, the self-stabilising oil-pressure bearing (SSO bearing) surpasses current types of ball, sleeve or liquid bearings in terms of long-term stability and quietness.

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    The rotary motion of the axis generates pressure upon the special oil enclosed within the bearing. This causes the build-up of a dynamic pressure field that centres and stabilises the axis within the bearing shell. While conventional liquid bearings employ the principle of hydrodynamic pressure too, the SSO bearing is equipped with an additional magnet that supports the self-stabilisation of the rotor axis. This allows for a faster, more precise and more reliable centring of the rotor axis and thus increases the long-term stability and quietness of the bearing: When the fan starts, the dynamic pressure field of the liquid bearing needs to build up first, which results in an initial precession of the axis, the so called gyro effect. This amounts to an increased abrasion until the axis is stabilised through the build-up of the dynamic pressure field, which may by and by lead to increased noise emission and bearing defects. Because of this, the SSO bearing possesses a built in magnet, whose field ensures the immediate self-stabilisation of the rotor and hence reduces the gyro effect. In addition to the stabilisation during the start-up phase of the fan, the supporting magnet allows for a more exact centring of the axis within the bearing shell and thus further reduces bearing resistance, abrasion and noise emission.

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    Noctua - Bild
    The sleeve and ball bearings currently predominating the fan market exhibit major drawbacks: While conventional sleeve bearings initially have very low noise emissions, they mostly possess unsatisfying long-term stability, which leads to a short overall lifespan and increasing noise after longer operating times. High grade ball bearings, on the other hand, while providing satisfying long-term stability operate at slightly higher noise levels from the beginning. The SSO bearing not only surpasses the quietness of conventional sleeve bearings but also the long-term stability of current top-of-the-line ball bearings.

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Noctua
29.01.2015 - ThinkComputers.org NH-U9S
Test verdict: "If you are looking for a smaller air cooler for a compact system this cooler is a great choice!" (Bob Buskirk, ThinkComputers.org)
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29.01.2015 - Syndrome-OC.net NF-F12 industrialPPC-2000 PWM
Test verdict: "Noctua nous fait part de deux gamme bien distinctes et qui ont deux publics différents. En effet, la gamme Redux se veut plus grand public avec des vitesses de fonctionnement plus bas et des bruits également plus bas. De son côté, la gamme iPPC se veut plus orientée industrie grâce à la présence de la norme IP 52. Les deux gammes proposent des performances de ce nom tout en étant performantes a des prix plutôt attractifs. La gestion PWM est également un plus pour ceux voulant un bruit faible provenant de sa tour." (Batiste Hocq, Syndrome-OC.net)
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27.01.2015 - Madshrimps.be NH-D15
Test verdict: "Noctua has raised the bar once more for high end air cooling products: the NH-D15 is without a doubt a stellar performer, in combination with the two included brilliant 140mm PWM fans it still keeps noise level reduced to a minimum. Even when running the D15 with a single centered fan the cooling performance is more than adequate to cool down your overclocked processors. Noctua has provided every accessory you need with this NH-D15, from the big thermal paste syringe to the Low Noise Adapters, everything you will need is included." (Albrecht Mesotten, Madshrimps.be)
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27.01.2015 - QWERTYmag.it NH-D15
Test verdict: "Siamo lieti di attribuire al Noctua NH-D15 il gold Award per prestazioni, rumorosità ed efficienza!" (Davide Torno, QWERTYmag.it)
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