Noctua (NF-B9 )1600rpm Premium Silent 92mm Fan - Sleeved

The NF-B9's highly-optimized blade design achieves an exceptional level of airflow and static pressure that most other fans can only reach at much higher speeds. Beveled blade tips, Vortex-Control Notches as well as Noctua's SC drive system and premium-grade SSO-Bearing ensure outstanding quietness and long-term stability

• Beveled Blade Tips
  Due to advanced design measures like the beveled blade tips, the NF-B9 is surprisingly quiet despite its outstanding airflow and pressure performance.


• Vortex-Control Notches
   Psychoacoustic optimizations like the Vortex-Control Notches make the NF-B9's noise pattern more pleasant to the human ear.


• Smooth Commutation Drive
  The new SC drive system reduces torque variations and thereby ensures improved running smoothness, particularly at lower speeds.


• Self-stabilizing oil-pressure bearing
  Noctua's well proven SSO-Bearing technology guarantees supremely quiet operation and exceptional long-term stability.

Noctua NF-9B Fan   Without Adapters With L.N.A. With U.L.N.A. Airflow 64.3 m³/h (37.8 CFM) 52.6 m³/h (30.9 CFM) 41.1 m³/h (24.2 CFM) Noise 19.8 dB(A) 16.9 dB(A) 12.6 dB(A) RPM (+/- 10%) 1600 1300 1000 Bearing SSO-Bearing Blade Geometry NF-B9 Blade Design Input Power 1.32 Watts Voltage Range 12 V MTBF > 150,000 H

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

19.02.2008: XSReviews.co.uk   I found that at the stock speed the fan was audible, but at a much more satisfactory tone than compared to a fan of similar dBA output. Using either of the adaptors and you'll have to come close to becoming Van Gogh before you'll hear the familiar hum of the blade swishing through the air. More importantly, the fan pushes a lot more air than other fans of this size for the same noise output; I couldn't find another 92mm fan that came close to the figures that Noctua list on the box. [...] This fan is perfect for people yearning for quiet PC's for their cases, or even their CPU coolers. I've seen many generic PC's that use 92mm fans which are far too loud for what they are doing. Using one of these instead will cost you a little bit more cash, but will allow you to run your PC without the background hum. Test verdict: The figures are awesome, and there aren't any other competitors that I know of in the fan market at this CFM for their dBA level. Couple with the 3 pin to molex converter and provided anti-vibration pegs, and you have the perfect silent fan. Once again, I'm going to plonk another Editors Choice down in Noctua's name. (Steve Parker, XSReviews.co.uk)