Noctua NF-A4x20 5V PWM, Premium Quiet Fan, 4-Pin, 5V Version (40x20mm, Brown)
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George
> 3 dayIts a little tall in proportion to the Jetson Nano but it works great.
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WesZ
> 3 dayThese are the best fans ever. Very quiet, easy to spin, move a lot of air and made of quality materials. They are a little on the expensive side, but thats because quality is more expensive.
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Derrel Lewis
> 3 dayAs it was advertised
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Thomas J. Coyle III
07-06-2025This fan is quite and keeps the Nano from throttling back during extensive AI/DL, however the cable is way too long for a NVIDIA Nano and had to be bunched up between the Nano heat sink and the top of the SBC case.
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Mike Thompson
> 3 dayUnless Im running something intense, the PWM fan is usually off. Then when the Jetson Nano gets warm the fan turns on just enough to cool it. I never notice this fan - I have to look at the blades to see if its spinning because its so quiet. The default fan I replaced came with a third party acrylic Jetson Nano case, it was not PWM, always running full speed and a noisy little fan at that. Ive seen other comments on the default fan saying its not very loud. I suspect the low quality, default case fan varies in noise from unit to unit. If you want quiet - Get the Noctua PWM! I got the thick one, so I had to find some longer screws. I should have gotten the thin one which I expect would work fine and use the existing HW. At any rate, if quiet and sanity are worth a couple coffees to you, get the Noctua PWM fan, such an improvement over the default fan that came with the third party Jetson Nano case.
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John Branthoover
> 3 dayInstalled on a Jetson Nano. I had to buy M2.5 x 8mm screws / washers and nuts. Fan will not turn unless the tempature is high or you turn it on via a software command.
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Ralse
> 3 dayPretty silent cooler for Raspberry Pi tower. Main chip temperature can be reduced to 35 degrees.
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cm
> 3 dayGreat cooling fan and so quiet.
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Burke04
> 3 dayFantastic high quality fan. It is amazingly silent and includes many adapters and extras. Packaging and instructions are top notch. You really get what you pay for.
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Ray Verrti
> 3 dayWorks the way is supposed to as advertised. A little bit noisy tho, but it does cool down my Jetson Nano quite a bit.
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.
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.
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Flow Acceleration ChannelsThe 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 BearingThe 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 PadsIntegrated 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
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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.
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| 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 |