Noctua NF-A4x20 5V PWM, Premium Quiet Fan, 4-Pin, 5V Version (40x20mm, Brown)

(1375 Reviews)

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$8.97

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(10000 available )

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62 Ratings
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Reviews
  • George

    09-06-2025

    Its a little tall in proportion to the Jetson Nano but it works great.

  • JR Yarbrough

    > 3 day

    Awsome for using on you GPUs. I have dual cards and it fits right in between them, and keeps them cool beautifully

  • Kirk Andrés Wilson

    > 3 day

    Super quiet fan. My workflow improved and I can record now without the fan Boise in background.

  • Jack T. Dicus

    > 3 day

    Plugged right into my nVidia Jetson Nano. Variable speed works great.

  • Big Z

    > 3 day

    I am really impressed with the amount of additional cables, connectors, and mounting options provided. I ordered the fan to place inside of a fursuit (costume) head. It is very quiet, if even one person is talking you cannot hear it running. The air flow is low, but it is constant and hands free so that is very nice. I thought it might be much louder than it was which is why I ordered the PWM version. Since it is *so* quiet theres no reason to not let it spin at full speed unless your application is severely power limited.

  • Gadgetry Guy

    > 3 day

    Noctua sets the standard for small, quiet, functional fans. My only desire is for Noctua to eventually adopt much thinner packaging. The current packaging, clearly design to reveal the products premium experience, is needlessly inconsiderate of its environmental impact.

  • cm

    > 3 day

    Great cooling fan and so quiet.

  • Noah

    > 3 day

    I bought this for my NVidia Jetson Nano because it was recommended by the Geekworm case I bought.

  • Rob

    > 3 day

    Noctua is a get what you pay for brand. They are expensive fans. But quiet and reliable. Definitely made the router under my desk quieter. Unlike some of the cheaper quiet fans, these guys will run for years and stay quiet.

  • Luke

    > 3 day

    Bought to replace noisy fans in a 1U unifi router enclosure. These are noisier, though theyre also much higher CFM.

NF-A4x20 5V PWM headerNF-A4x20 5V PWM header

Featuring advanced aerodynamic design measures such as Flow Acceleration Channels and an AAO frame, the NF-A4x20 5V PWM is a PWM enabled 5V variant of Noctua’s highly optimised, premium quality quiet 40x20mm fan. The custom designed NE-FD3 PWM IC that integrates Smooth Commutation Drive technology and Noctua’s reference class SSO2 bearings assure superb running smoothness and excellent long-term stability. Topped off with modular cabling and the OmniJoin Adaptor Set, the NF-A4x20 5V PWM is a premium choice for demanding 5V applications that require PWM control.

NF-A4x20 5V PWMNF-A4x20 5V PWM

5V PWM version

Many devices such as network or storage solutions use 5 volt 40mm fans with PWM speed control. With the same operating voltage, PWM support and the included OmniJoin adaptor set that makes it compatible with proprietary fan headers, the NF-A4x20 5V PWM is ideal for replacing noisy or broken 5V 40mm fans with PWM.

Please Note: Being a 5V fan, the NF-A4x20 5V PWM cannot be run at 12V and will be damaged when used with typical 12V power sources such as PC motherboard fan headers.

NF-A4x20 FACNF-A4x20 FAC

SSO2SSO2

NF-A4x20 AVPNF-A4x20 AVP

NF-A4x20 5V PWM scopeNF-A4x20 5V PWM scope

Flow Acceleration Channels

The NF-A4x20 impeller features suction side Flow Acceleration Channels. By speeding up the airflow at the crucial outer blade regions, this measure reduces suction side flow separation and thus leads to better efficiency and lower vortex noise.

SSO2 Bearing

The NF-A4x20 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.

Integrated Anti-Vibration Pads

Integrated Anti-Vibration Pads made from extra-soft silicone minimise the transmission of minute vibrations while maintaining full compatibility with all standard mounting systems and fan clips used on heatsinks.

Scope of delivery

  • NA-YC1 4-pin PWM y-cable
  • NA-EC1 30cm extension cable
  • OmniJoin adaptor set
  • 4x NA-AV3 anti-vibration mounts
  • Fan screws
NF-A4x20 5V bannerNF-A4x20 5V banner

Please Note:

Being a 5V fan, the NF-A4x20 5V PWM cannot be run at 12V and will be damaged when used with typical 12V power sources such as PC motherboard fan headers.

NF-A4x20 PWM table NF-A4x20 FLX table NF-A4x20 5V PWM table NF-A4x20 5V table
NF-A4x20 PWM NF-A4x20 FLX NF-A4x20 5V PWM NF-A4x20 5V
Connector 4-pin PWM 3-pin 4-pin PWM 3-pin
Voltage 12V 12V 5V 5V
RPM Max: 5000 / Min: 1200 5000 Max: 5000 / Min: 1100 5000
RPM with L.N.A. 4400 4400 - -
RPM with U.L.N.A. - 3700 - -
Acoustical Noise 14,9 dB(A) 14,9 dB(A) 14,9 dB(A) 14,9 dB(A)
Acoustical Noise with L.N.A. 12,2 dB(A) 12,2 dB(A) - -
Acoustical Noise with U.L.N.A. - 8,5 dB(A) - -
Size 40x40x20 mm 40x40x20 mm 40x40x20 mm 40x40x20 mm
Colour Brown & Beige Brown & Beige Brown & Beige Brown & Beige

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