Noctua NF-A4x20 5V PWM, Premium Quiet Fan, 4-Pin, 5V Version (40x20mm, Brown)
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Damien D Ortiz
Greater than one weekyes they look pretty funky with the colors but they do such a great job of pushing air and cooling the intended product.
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What.
Greater than one weekProgrammable fan for my Jetson Nano.
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Elfcake
> 3 dayI bought two of these little gems with the intent of installing them to cool a pair of NVMe drives. Instead I created a bracket to mount both to place on the front end of an Sapphire RX580 Nitro. I set the fan speed to the lowest setting in BIOS and now the main GPU fans never come on. Temps are always in the mid 20c. Now I have to buy two more for the NVMe drives.
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Nathan Martin
> 3 dayInstalled this fan on to a nVidia Jetson Nano and fit perfectly. I did get a case for the Jetson Nano that provided the appropriate screws that properly mounted the fan with though. This fan kit doesnt come with those as the parts that come with the fan are more used for mounting to a something like a computer case.
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Len
12-06-2025perfect for the Nvidia Jetson Nano.
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Critical Thinker
> 3 dayWorks well, a bit tricky to install and I dont know what to do with all the leftover connectors.
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aKent
10-06-2025Im using this with the Jetson Nano. You cant hear it at all, even at full speed!
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Jack T. Dicus
> 3 dayPlugged right into my nVidia Jetson Nano. Variable speed works great.
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C. Capeland
> 3 dayFor this tiny size, these are amazingly quiet and effective. Really a marvel.
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jumper
> 3 dayeasy to install, will buy again
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 |