Mag. Manfred Stadler MBA of the Austrian Institute for Heat-Transmission and Fan Technology (Österreichisches Institut für Wärmeübertragung und
Ventilatorentechnik, ÖIWV) about the development of the Noctua Raised-Blade and Straight-Blade-Designs:

"In the area of PC cooling, the last years saw a growing demand for axial fans with the lowest possible noise emission, which manufacturers mostly met by simply
reducing the RPM of existing models without sufficiently adapting the blade geometry and profile to the modified fluid dynamic parameters. The comparison of
measured data and simulation outputs showed that the result was an average deficit of efficiency of 10-15%. The complete redevelopment of the blade geometry
and profile was carried out with exact fluid mechanical adjustment to minimal noise emission in a speed range of 400-1800RPM at a height of 25mm and a radius
of 40 and 60mm. Both fan blades possess 8-12% more flow rate than comparable products at the same total noise emission and static pressure." (Mag. Manfred
Stadler MBA, Austrian Institute for Heat-Transmission and Fan Technology (Österreichisches Institut für Wärmeübertragung und Ventilatorentechnik, ÖIWV))


SSO-Bearing
Thanks to an optimised principle of operation, the self-stabilising oil-pressure bearing (SSO bearing) of the Noctua NF-S12 and NF-R8 series surpasses current
types of ball, sleeve or liquid bearings in terms of long-term stability and quietness.


SSO Prinicipale Of Operation
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.


SSO-Bearings When Compared To Traditional Sleeve And Ball Bearing
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
Noctua NF-R8 80mm Quiet Computer Fan
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Noctua NF-R8 80mm Quiet Computer Fan.
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Airflow-Optimized Blade Geometry
Noctua NF-R8 80mm Quiet Case Fan

The NF-R8 is the first fan employing a novel 80mm rotor which was developed by the Austrian Institute for Heat-Transmission and Fan Technology
(Österreichisches Institut für Wärmeübertragung und Ventilatorentechnik, ÖIWV). Thanks to the special optimisation of the blade geometry towards ultra low noise
application, the NF-R8 is up to 10% more quiet than current high-end fans at the same flow rate.

Self-stabilising oil-pressure bearing (SSO bearing): The NF-R8 series are equipped with a magnetically centred, self lubricating oil-pressure bearing that provides
a new level of quietness and long-term stability.


Specs: 1800 RPM 17 dB(A) @ 22 CFM

Size  80x80x25 mm

Bearing  SSO-Bearing  

Blade Geometry  Raised-Blade-Design  

Rotational Speed (+/- 10%)  1800 RPM

Rotational Speed with L.N.A. (+/- 10%)  1300 RPM

Rotational Speed with U.L.N.A. (+/- 10%)  800 RPM

Airflow  53 m³/h

Airflow with L.N.A.  39 m³/h

Airflow with U.L.N.A.  26 m³/h

Acoustical Noise  17 dB(A)

Acoustical Noise with L.N.A.  10 dB(A)

Acoustical Noise with U.L.N.A.  7* dB(A)

Input Power  1,32 W

Input Current  0,11 A

Voltage Range  4-13 V

MTBF  > 150.000 h


Scope of Delivery  Ultra-Low-Noise Adaptor (U.L.N.A.)
Low-Noise Adaptor (L.N.A.)
4 Vibration Compensators
3:4-Pin Adaptor
4 Fan Screws


Warranty  6 years


About Noctua Raised Blade Desighn
Current silent fans frequently employ conventional blade geometries, which were developed for higher speed ranges and significantly lose efficiency at lower
rotation speeds. The Noctua Raised-Blade-Design of the NF-R8 series was developed by the Austrian Institute for Heat-Transmission and Fan Technology
(Österreichisches Institut für Wärmeübertragung und Ventilatorentechnik, ÖIWV) and specifically tailored to 80mm fans with extremely low rotation speeds. The
result is a performance improvement of up to 10% compared to conventional blade geometries.

Both the angle of attack and the design of the blade area of the NF-R8 rotor are optimised for maximum airflow and minimum noise emission at speed ranges
below 1800RPM. Raising the leading edge above the rotor hub and lowering the trailing edge below the bottom of the rotor hub results in an extended profile
chord length, which compensates for the reduction in blade surface caused by the steeper angle of attack and hence increases the overall blade force. The
continuous radial increase of the blade curvature towards the blade tips ensures sufficient static pressure despite of the slow rotation speeds. A significant
reduction in noise emission is achieved through the rounding of the fan blades towards the rotor hub as well as the rounding of the rotor hub itself. This way, the
NF-R8 is significantly more quiet than other high end silent fans at the same performance thanks to its specific optimisations for ultra low noise application.
80mm quiet computer case fan
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Why not spare your hearing with Acoustic PC’s Quiet Computer Cooling and Soundproofing
Solutions. Acoustic PC Stocks Quiet Computer Parts. Quiet PC Fans, Quiet CPU Coolers, Quiet
Power Supply, Quiet Computer Cases, PC Sound Dampening insulation, Ant-vibration Noise
Reduction materials such as Silicone Fan Mounts, Sorbothane Feet for Ultra Low noise PC's. We
also sell Silent PC Hardware components and Gaming products such as Fanless Silent Video
cards, SSD Drives, Professional Gaming peripherals for serious Gamers. Audio products & more.