---
product_id: 43512932
title: "Noctua NF-A4x20 5V PWM, Premium Quiet Fan, 4-Pin, 5V Version (40x20mm, Brown)"
brand: "noctua"
price: "2046100₫"
currency: VND
in_stock: true
reviews_count: 13
url: https://www.desertcart.vn/products/43512932-noctua-nf-a4x20-5v-pwm-premium-quiet-fan-4-pin
store_origin: VN
region: Vietnam
---

# >150,000 h MTTF lifespan 5000 RPM max speed Ultra-quiet 14.9 dB(A) Noctua NF-A4x20 5V PWM, Premium Quiet Fan, 4-Pin, 5V Version (40x20mm, Brown)

**Brand:** noctua
**Price:** 2046100₫
**Availability:** ✅ In Stock

## Summary

> 🛠️ Quiet power in a compact package — cool smarter, not louder!

## Quick Answers

- **What is this?** Noctua NF-A4x20 5V PWM, Premium Quiet Fan, 4-Pin, 5V Version (40x20mm, Brown) by noctua
- **How much does it cost?** 2046100₫ with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vn](https://www.desertcart.vn/products/43512932-noctua-nf-a4x20-5v-pwm-premium-quiet-fan-4-pin)

## Best For

- noctua enthusiasts

## Why This Product

- Trusted noctua brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Built to Last:** Engineered with premium fibre-glass reinforced PBT and backed by a 6-year warranty for unmatched durability.
- • **Compact Powerhouse:** Slim 40x40x20mm size fits perfectly in tight spaces like NVIDIA Jetson Nano, 1U servers, and network gear.
- • **Precision PWM Control:** 4-pin PWM interface lets you fine-tune fan speed for optimal cooling efficiency and power savings on 5V systems.
- • **Whisper-Quiet Cooling:** Experience near-silent airflow at just 14.9 dB(A), perfect for focused workspaces and noise-sensitive environments.
- • **Complete Installation Kit:** Includes anti-vibration mounts, extension cables, and OmniJoin adaptors for seamless integration with proprietary headers.

## Overview

The Noctua NF-A4x20 5V PWM is a premium, ultra-quiet 40x40x20mm fan designed for 5V applications requiring precise PWM speed control. Operating at up to 5000 RPM with a noise level as low as 14.9 dB(A), it delivers efficient cooling in compact devices like NVIDIA Jetson Nano and network equipment. Built with durable materials and featuring advanced aerodynamic design, it offers a lifespan exceeding 150,000 hours and comes with a comprehensive mounting and connection kit, backed by a 6-year warranty.

## Description

Product description 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. 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 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.

Review: UPDATE: Super quiet fan, [give it a shot!] - ----- Start of Update 12OCT24 ----- The Noctua Fan had previously received many high regards, so I decided to run it longer term and compare it with the orginal Caizhu Fan on the Bitaxe 401 Supra. One can fully customize the settings to run at varying input voltages and pair them up with varying frequencies. I just "picked on" one setting and ran the Bitaxe with the original fan (Caizhu), then the Noctua, as follows: ASIC Voltage Requested: 1.166 V ASIC Frequency: 475 Mhz Fan RPM Setting (Manual): 75% Caizhu Fan: 6,896 RPM Bitaxe Power: 12.0 Watts ASIC Temp: 47°C Expected Gh/s: 606 Run Time: 15.043 hours Average Shares p/Hour: 378.052 (Total Shares this Session: 5,687) Shares p/Rejected: 145.821 Average Rejected p/Hour: 2.593 (Total Rejected this Session: 39) Gh/s Ranges: 473-810 Efficiency Ranges: 17-21 J/Th Best Difficulty (this session): 4.6M Noctua Fan: 5,538 RPM Bitaxe Power: 11.6 Watts ASIC Temp: 46°C Expected Gh/s: 606 Run Time: 15.211 hours Average Shares p/Hour: 380.436 (Total Shares this Session: 5,787) Shares p/Rejected: 170.206 Average Rejected p/Hour: 2.235 (Total Rejected this Session: 34) Gh/s Ranges: 442-802 Efficiency Ranges: 17-21 J/Th Best Difficulty (this session): 4.01M Now, other settings can render different results, but I will just say the obvious, the Noctua doesn't need to spin faster to move more air, it's designed that way, it's why it's good (and I was too quick to judge). It allowed the Bitaxe to consume a bit less power, run 1°C cooler and was also a bit more efficient in the long run. After giving it a fair shake over the last week, I prefer the Noctua over the Caizhu and I know someone else in the house that REALLY appreciates how quiet it runs. I would purchase a Noctua fan for any future Bitaxes that I acquire. Rating increased from 4 to 5 Stars. ----- End of Update 12OCT24 ----- The NF-A4x20 5V PWM came in a fancy package, with wiring adapters and mounting hardware. I just needed the fan. This fan is the fastest of the Noctua fans, rated at 5,000 RPM +/- 10%, which mine ran at just over 5,400 RPM when I installed it on the Bitaxe 401 Supra. I was disappointed to find that at MAX RPM (5,400), it did not move more air than the stock CAIZHU-FAN (I ran it at 6,750 RPM, or 88% fan speed on the Bitaxe). Even at the MAX speed of 5,400 RPM, the Noctua allowed my Bitaxe to run 6°C hotter than with the CAIZHU-FAN at 6,750 RPM (88% of MAX speed). Furthermore, this Noctua fan causes my Bitaxe to consume 16.2 Watts, versus 15.2 Watts with the stock fan. So, in short, it moves less air and consumes more power :^| On the other hand, the Noctua runs extremely quiet, as advertised "14.9 dB(A)", while the CAIZHU-FAN runs a bit noisy, especially when passing 5,000 RPM. It's up to you. Do you want to run your Bitaxe hotter by 6°C and consume an extra Watt of Power, but it's much quieter? Do you want the sound of the fan in the background, evidence of work in progress, but the Bitaxe runs better? If Noctua would make a 40x40x20 5V PWM fan that was rated at 8,000 RPM, I would love to compare that in operation to the stock CAIZHU-FAN on my Bitaxe 401 Supra. If it cools more, I would be a fan of the Noctua (pun exquisitely intended).
Review: Best fans money can buy - The best fans that you can buy for your application. Very durable and well built The included hardware is top notch and the splitter is such a welcome addition to have. I have three of these all cooling my BitAxe miners and they are very efficient and quiet, even when running at higher rpm's. Expect Noctua fans to last longer than your electronic device. Just clean then every so often of dust that can accumulate on the fans and you can expect them to have a very long lifespan.

## Features

- Premium quiet fan, 40x40x20 mm, 5V, 4-pin PWM, max. 5000 RPM, max. 14.9 dB(A), >150,000 h MTTF
- Award-winning A-series design with Flow Acceleration Channels and Advanced Acoustic Optimisation frame for superior quiet cooling performance
- 40x20mm size ideal for NVIDIA Jetson Nano, 1U applications or replacing fans in network and storage equipment (routers, switches, NAS etc.) or other devices such as DVRs
- 5V 4-pin PWM version (5000rpm maximum speed) for 5V applications with PWM control
- Includes anti-vibration mounts, fan screws, extension cable and OmniJoin adaptor set for connecting the fan to proprietary fan headers

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B071FNHVXN |
| Best Sellers Rank | #251 in Computer Case Fans |
| Brand | Noctua |
| Brand Name | Noctua |
| Compatible Devices | Desktop |
| Cooling Method | Air |
| Customer Reviews | 4.8 out of 5 stars 897 Reviews |
| Global Trade Identification Number | 09010018100136 |
| Item Dimensions L x W x H | 1.57"L x 0.79"W x 1.57"H |
| Item Weight | 84 Grams |
| Manufacturer | Noctua |
| Material Type | Fibre-glass reinforced PBT |
| Maximum Rotational Speed | 5000 RPM |
| Model | NF-A4x205VPWM |
| Noise Level | 14.9 Decibels |
| Number of Items | 1 |
| Part Number | NF-A4x20 5V PWM |
| Power Connector Type | 4-Pin |
| Product Dimensions | 1.57"L x 0.79"W x 1.57"H |
| Unit Count | 1.0 Count |
| Voltage | 5 Volts |
| Warranty Description | 6 year manufacturer’s warranty |

## Product Details

- **Brand:** Noctua
- **Compatible Devices:** Desktop
- **Cooling Method:** Air
- **Global Trade Identification Number:** 09010018100136
- **Material:** Fibre-glass reinforced PBT
- **Maximum Rotational Speed:** 5000 RPM
- **Noise Level:** 14.9 Decibels
- **Power Connector Type:** 4-Pin
- **Product Dimensions:** 1.57"L x 0.79"W x 1.57"H
- **Voltage:** 5 Volts

## Images

![Noctua NF-A4x20 5V PWM, Premium Quiet Fan, 4-Pin, 5V Version (40x20mm, Brown) - Image 1](https://m.media-amazon.com/images/I/71lyRpVR4OL.jpg)
![Noctua NF-A4x20 5V PWM, Premium Quiet Fan, 4-Pin, 5V Version (40x20mm, Brown) - Image 2](https://m.media-amazon.com/images/I/71hrcJhq7BL.jpg)
![Noctua NF-A4x20 5V PWM, Premium Quiet Fan, 4-Pin, 5V Version (40x20mm, Brown) - Image 3](https://m.media-amazon.com/images/I/81LqMRpLO2L.jpg)
![Noctua NF-A4x20 5V PWM, Premium Quiet Fan, 4-Pin, 5V Version (40x20mm, Brown) - Image 4](https://m.media-amazon.com/images/I/81abh0+LmWL.jpg)
![Noctua NF-A4x20 5V PWM, Premium Quiet Fan, 4-Pin, 5V Version (40x20mm, Brown) - Image 5](https://m.media-amazon.com/images/I/71WxE+WP+2L.jpg)

## Questions & Answers

**Q: what is the cfm rating?**
A: 5.532631039983588 CFM

**Q: Can these be wired to a usb connector and run off a usb wall charger?**
A: Yes. I run mine off of the gpio pins on a raspberry pi. That's the same concept.

**Q: Does this noctua nf-a4x20 5v pwm premium-quality quiet 40mm fan come with the mounting screws?**
A: Yes, it comes with screws a couple of different connectors for attaching it to 3 and 4 pin connections also some rubbery plug things to pull through the mount holes.

**Q: Can a 3.3v PWM signal be used to control fan speed?**
A: Yes, a 3.3V logic (PWM) signal will control this fan.  I use an Arduino DUE board to control this fan.  The DUE puts out 3.3V logic signals.

## Customer Reviews

### ⭐⭐⭐⭐⭐ UPDATE: Super quiet fan, [give it a shot!]
*by G***R on September 23, 2024*

----- Start of Update 12OCT24 ----- The Noctua Fan had previously received many high regards, so I decided to run it longer term and compare it with the orginal Caizhu Fan on the Bitaxe 401 Supra. One can fully customize the settings to run at varying input voltages and pair them up with varying frequencies. I just "picked on" one setting and ran the Bitaxe with the original fan (Caizhu), then the Noctua, as follows: ASIC Voltage Requested: 1.166 V ASIC Frequency: 475 Mhz Fan RPM Setting (Manual): 75% Caizhu Fan: 6,896 RPM Bitaxe Power: 12.0 Watts ASIC Temp: 47°C Expected Gh/s: 606 Run Time: 15.043 hours Average Shares p/Hour: 378.052 (Total Shares this Session: 5,687) Shares p/Rejected: 145.821 Average Rejected p/Hour: 2.593 (Total Rejected this Session: 39) Gh/s Ranges: 473-810 Efficiency Ranges: 17-21 J/Th Best Difficulty (this session): 4.6M Noctua Fan: 5,538 RPM Bitaxe Power: 11.6 Watts ASIC Temp: 46°C Expected Gh/s: 606 Run Time: 15.211 hours Average Shares p/Hour: 380.436 (Total Shares this Session: 5,787) Shares p/Rejected: 170.206 Average Rejected p/Hour: 2.235 (Total Rejected this Session: 34) Gh/s Ranges: 442-802 Efficiency Ranges: 17-21 J/Th Best Difficulty (this session): 4.01M Now, other settings can render different results, but I will just say the obvious, the Noctua doesn't need to spin faster to move more air, it's designed that way, it's why it's good (and I was too quick to judge). It allowed the Bitaxe to consume a bit less power, run 1°C cooler and was also a bit more efficient in the long run. After giving it a fair shake over the last week, I prefer the Noctua over the Caizhu and I know someone else in the house that REALLY appreciates how quiet it runs. I would purchase a Noctua fan for any future Bitaxes that I acquire. Rating increased from 4 to 5 Stars. ----- End of Update 12OCT24 ----- The NF-A4x20 5V PWM came in a fancy package, with wiring adapters and mounting hardware. I just needed the fan. This fan is the fastest of the Noctua fans, rated at 5,000 RPM +/- 10%, which mine ran at just over 5,400 RPM when I installed it on the Bitaxe 401 Supra. I was disappointed to find that at MAX RPM (5,400), it did not move more air than the stock CAIZHU-FAN (I ran it at 6,750 RPM, or 88% fan speed on the Bitaxe). Even at the MAX speed of 5,400 RPM, the Noctua allowed my Bitaxe to run 6°C hotter than with the CAIZHU-FAN at 6,750 RPM (88% of MAX speed). Furthermore, this Noctua fan causes my Bitaxe to consume 16.2 Watts, versus 15.2 Watts with the stock fan. So, in short, it moves less air and consumes more power :^| On the other hand, the Noctua runs extremely quiet, as advertised "14.9 dB(A)", while the CAIZHU-FAN runs a bit noisy, especially when passing 5,000 RPM. It's up to you. Do you want to run your Bitaxe hotter by 6°C and consume an extra Watt of Power, but it's much quieter? Do you want the sound of the fan in the background, evidence of work in progress, but the Bitaxe runs better? If Noctua would make a 40x40x20 5V PWM fan that was rated at 8,000 RPM, I would love to compare that in operation to the stock CAIZHU-FAN on my Bitaxe 401 Supra. If it cools more, I would be a fan of the Noctua (pun exquisitely intended).

### ⭐⭐⭐⭐⭐ Best fans money can buy
*by A***R on August 28, 2025*

The best fans that you can buy for your application. Very durable and well built The included hardware is top notch and the splitter is such a welcome addition to have. I have three of these all cooling my BitAxe miners and they are very efficient and quiet, even when running at higher rpm's. Expect Noctua fans to last longer than your electronic device. Just clean then every so often of dust that can accumulate on the fans and you can expect them to have a very long lifespan.

### ⭐⭐⭐⭐⭐ You can't go wrong with Noctua
*by V***C on November 10, 2025*

I mean, Its a noctua fan. What more do I have to say? It is exceptionally quiet. Pushes a nice amount of airflow for its size.

## Frequently Bought Together

- Noctua NF-A4x20 5V PWM, Premium Quiet Fan, 4-Pin, 5V Version (40x20mm, Brown)
- Bitaxe Gamma - Solo Satoshi | Made in USA | Power Supply & Stand Included. | ~1.2TH/s @ ~18W | Wi-Fi | Plug and Play Bitcoin Miner.
- Bitaxe Stand - Case and Stand for Fully Open Source Bitcoin Miner Bitaxe

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*Product available on Desertcart Vietnam*
*Store origin: VN*
*Last updated: 2026-05-18*