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Nine Blade Design

The NF-S12B sports a further refined version of the original NF-S12’s Straight-Blade-Design that broke new ground in the realm of quiet PC cooling in 2006 and quickly became renowned for its excellent airflow/noise ratio, making the NF-S12 one of the last years’ most successful fans in the PC cooling market.

Building on the proven basis of the award-winning NF-S12’s impeller, the design goal for the NF-S12B was to further improve its predecessor’s much acclaimed airflow/noise ratio and to increase static pressure in order to allow for a broader range of application. These goals have been achieved by reducing the tip clearance at the leading edge and adding Bevelled Blade-Tips, a feature first introduced with the NF-B9 92mm fan.

NF-S12B Blade Design


Reducing the tip clearance by increasing the length of the blades allows for a bigger blade surface area as well as improvements both in airflow and static pressure. This measure though tends to come at the expense of increased noise emission due to critical rotor-stator interaction. For the NF-S12B, this issue has been dealt with by only increasing the length of the blades at the leading edges and adding a bevelled structure (Bevelled Blade-Tips). By increasing the distance between the impeller and the frame at the outermost areas of the fan where the impeller achieves the highest velocities, Bevelled Blade-Tips help to reduce critical rotor-stator interaction. As a result, the NF-S12B’s modification of the original NF-S12 blade geometry combines the benefits of a reduced tip clearance with those of a bigger distance between the tip of the trailing edge and stator parts, achieving up to 10% improvement both in airflow to noise and pressure to noise ratio.

NF-S12B Blade Design


NF-S12B Blade Design


At 1200rpm, the NF-S12B FLX produces 18% more airflow and 14% more static pressure than its predecessor at 1300rpm. Running at 100rpm slower, the NF-S12B is almost 1dB(A) quieter at the same time!

NF-S12B Blade Design


At 700rpm, the NF-S12B ULN produced 13% more airflow and 16% more static pressure than its predecessor. Despite of this impressive boost in performance, the NF-S12B runs just as quiet as the NF-S12!

NF-S12B Blade Design





Noctua
25.04.2015 - BestPCInfo.pl NH-L9x65
Test verdict: "Noctua NH-L9x65 to wprawdzie bardzo kompaktowy cooler CPU ale mimo to jest on godnym następcą modelu NH-L9. Po pierwsze oferowana przez niego wydajność już bez problemu wystarczy do zastosowań przy chłodzeniu nawet wydajniejszych procesorów (a przynajmniej jeśli chodzi o jednostki 4-rdzeniowe). Po drugie producent nie rozdziela już tego modelu coolera na wersję dla AMD i wersję dla Intel a zatem jest to rozwiązanie zdecydowanie bardziej uniwersalne." (Łukasz Talkowski, BestPCInfo.pl)
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24.04.2015 - hwresources.org NH-L9x65
Test verdict: "Ci sentiamo di consigliare caldamente il nuovo Noctua per tutti gli usi, non solo per HTPC, tenere testa e battere soluzioni più grosse dimostra la cura in cui Noctua ripone nei suoi prodotti." (Michele Mura, hwresources.org)
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22.04.2015 - OCDrift.com NH-U9S
Test verdict: "In the end, the Noctua NH-D9L, U9S and L9x65 are certainly among the best 92 mm low-profile coolers in the market that money can buy. For rig builders who are planning to set up a small HTPC and small form factor system, these coolers could be the perfect choice for you!" (Kevin Owi Kheng Him, OCDrift.com)
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22.04.2015 - The Tech Buyer's Guru NH-L9x65
Test verdict: "All in all, then, the Noctua NH-L9x65 offers a winning combination of build quality, features, and performance for a niche, informed audience, willing to work within its limits to achieve truly stellar performance in an ultra-compact form factor." (Ari Altmann, The Tech Buyer's Guru)
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