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Noctua > 
Item#: N82E16835608033

Noctua A-Series NF-A4x10 40mm Blades with AAO Frame, SSO2 Bearing Premium Fan

  • 40mm
  • Rotational Speed (+/- 10%): 4500 RPM
  • Rotational Speed with L.N.A. (+/- 10%): 3700 RPM Airflow: 8.2 m3/h
  • Airflow with L.N.A.: 6.6 m3/h
  • SSO2
  • Acoustical Noise: 17.9 dB(A)
  • Acoustical Noise w
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The NF-A4x10 FLX features advanced aerodynamic design measures such as Flow Acceleration Channels and Noctua’s AAO frame, which make it a highly optimised, premium quality quiet fan in 40x10mm size. Smooth Commutation Drive technology and Noctua’s reference class SSO2 bearings guarantee superb running smoothness and excellent long-term stability. Topped off with modular cabling, a Low-Noise Adaptor and OmniJoin Adaptor Set, the NF-A4x10 is a premium choice for the highest demands.

  • newegg Designed to cool The NF-A4x10 impeller features suction side Flow Acceleration Channels to reduce suction side flow separation for better efficiency and lower vortex noise. The reduced motor hub size allows for more blade surface area and thus contributes to the NF-A4x10’s superior airflow and pressure performance.
  • newegg Cools quietly Noctua’s AAO (Advanced Acoustic Optimisation) frames feature integrated anti-vibration pads as well as Noctua’s unique Stepped Inlet Design and Inner Surface Microstructures, both of which further refine the fan’s performance/noise efficiency. The Low-Noise Adaptor (L.N.A.) is supplied to reduce the maximum fan speed from 4500 to 3700rpm so that it can be fine-tuned for superior airflow or maximum quietness. And the latest version of Noctua’s advanced Smooth Commutation Drive system ensures superb running smoothness by eliminating torque variations and switching noises.
  • newegg SSO2 Bearing The NF-A4x10 features the further optimised second generation of Noctua’s renowned, time-tested SSO bearing. With SSO2, the rear magnet is placed closer to the axis to provide even better stabilisation, precision and durability.
  • newegg 3 to 2-pin Adaptor and Polarity Protection The NF-A4x10 comes with an adaptor from 3-pin Molex to the 2-pin connectors used on many graphics cards or network and storage devices. An integrated diode provides polarity protection on 2-pin connections.
  • newegg OmniJoin Adaptor Set Many devices featuring 40mm fans use proprietary fan headers, so the NF-A4x10 comes with Noctua’s OmniJoin Adaptor Set. Just cut the original fan’s cable, fix it to the adaptor using the supplied 3M Scotchlok connectors and you can plug the NF-A4x10 to proprietary fan headers!
  • newegg Extensive Cabling Options The fan’s short 20cm primary cable minimises cable clutter in typical applications while the supplied 30cm extension provides extended reach when necessary. Both cables are fully sleeved.

Learn more about the Noctua NF-A4x10




Case Fan
Fan Size
Bearing Type
Rotational Speed (+/- 10%): 4500 RPM
Rotational Speed with L.N.A. (+/- 10%): 3700 RPM
Air Flow
Airflow: 8.2 m3/h
Airflow with L.N.A.: 6.6 m3/h
Noise Level
Acoustical Noise: 17.9 dB(A)
Acoustical Noise with L.N.A.: 12.9 dB(A)
Power Connector
3 Pin

Physical Spec

40 x 40 x 10mm


Flow Acceleration Channels

Reduced Motor Hub Size

AAO Frame

Stepped Inlet Design

Inner Surface Microstructures

Integrated Anti-Vibration Pads

Smooth Commutation Drive 2

Low-Noise Adaptor for full flexibility

3 to 2-pin Adaptor and Polarity Protection

OmniJoin Adaptor Set

Package Contents

Package Contents
Low-Noise Adaptor (L.N.A.)
3:2 Pin Adaptor
OmniJoin Adaptor Set
30cm Extension Cable
4 Vibration-Compensators
4 Fan Screws

Quick Info


  • Limited Warranty period (parts): 6 years
  • Limited Warranty period (labor): 6 years

Customer Reviews of the Noctua NF-A4x10

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  • Daniel O.
  • 6/4/2014 5:32:05 PM
  • Tech Level: Somewhat High
  • Ownership: 1 week to 1 month

5 out of 5 eggsGreat Quiet Cooling Fan

Pros: Very Quiet fan. Has additional connectors so that you can vary the speed - but who would need them - the fan is quiet at full speed.

Cons: Had to purchase it from another on-line vendor because their normal price for this fan is 14 bucks with free shipping

Other Thoughts: I purchased the fan to replace a failing fan in a NSA-310 NAS device. The Connector on the original fan was a mini 3-plug connector, so I cut it off, used a 3 pin female connector from a Molex 4 Pin to 3 Pin adaptor and made a mini to standard size 3 pin adaptor. Works great and is so quiet, I have to check and make sure it is working from time to time.

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  • David M.
  • 4/24/2014 1:36:33 PM
  • Tech Level: Somewhat High
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsBlissful Silence

Pros: Nearly inaudible running at 2300 RPM.. Better airflow than the fan it replaced @ one-fourth the RPMs.

Cons: N/A

Other Thoughts: This NF-A4x10 fan replaced the OEM ASUS USB fan for the X79 Sabertooth motherboard. The OEM 35mm fan was louder, by factors, than all of the other 5 Noctua case fans combined. Although the NF-A4x10 fan did not fit IN the OEM slot in the armor, it nested ABOVE it exactly. It tucked beneath the rear case fan nicely, and if I'd had a 1cm longer screw, it could have been secured in one hole. As it is, a little JB weld one either side sufficed for added, but unneeded security.

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Home > 
Computer Hardware > 
Fans & PC Cooling > 
Case Fans > 
Noctua > 
Item#: N82E16835608033
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