---
product_id: 43512932
title: "NF-A4x20 5V PWM, Premium Quiet Fan, 4-Pin, 5V Version (40x20mm, Brown)"
brand: "noctua"
price: "5670 som"
currency: KGS
in_stock: true
reviews_count: 13
category: "Noctua"
url: https://www.desertcart.kg/products/43512932-nf-a4x20-5v-pwm-premium-quiet-fan-4-pin-5v
store_origin: KG
region: Kyrgyzstan
---

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

**Brand:** noctua
**Price:** 5670 som
**Availability:** ✅ In Stock

## Summary

> 🛠️ Silent cooling that means business — keep your gear chill and your workspace zen.

## Quick Answers

- **What is this?** NF-A4x20 5V PWM, Premium Quiet Fan, 4-Pin, 5V Version (40x20mm, Brown) by noctua
- **How much does it cost?** 5670 som with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.kg](https://www.desertcart.kg/products/43512932-nf-a4x20-5v-pwm-premium-quiet-fan-4-pin-5v)

## 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 fibre-glass reinforced PBT and boasting over 150,000 hours mean time to failure for unmatched durability.
- • **Compact Yet Mighty:** Sized at 40x40x20 mm, ideal for tight 1U setups, NVIDIA Jetson Nano, and network/storage gear without compromise.
- • **Precision PWM Control:** 4-pin PWM interface lets you fine-tune fan speed up to 5000 RPM for optimal airflow and energy efficiency.
- • **Whisper-Quiet Powerhouse:** Experience premium cooling with barely-there noise at just 14.9 dB(A), perfect for focused workspaces.
- • **All-Inclusive Installation Kit:** Comes with anti-vibration mounts, screws, extension cable, and OmniJoin adaptors—plug & play perfection.

## Overview

The Noctua NF-A4x20 5V PWM is a premium, ultra-quiet 40x40x20 mm cooling fan designed for 5V applications with PWM speed control. Delivering up to 5000 RPM at a whisper-quiet 14.9 dB(A), it’s engineered for compact devices like NVIDIA Jetson Nano, 1U servers, and network/storage equipment. Built with durable fibre-glass reinforced PBT and rated for over 150,000 hours MTTF, it includes a full mounting and connection kit for seamless integration.

## Description

Buy Noctua NF-A4x20 5V PWM, Premium Quiet Fan, 4-Pin, 5V Version (40x20mm, Brown): Case Fans - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

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.
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).

## 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 | #101 in Computer Case Fans |
| Brand | Noctua |
| Color | Brown |
| Compatible Devices | Desktop |
| Cooling Method | Air |
| Customer Reviews | 4.7 4.7 out of 5 stars (3,716) |
| Date First Available | May 31, 2017 |
| Global Trade Identification Number | 09010018100136 |
| Is Discontinued By Manufacturer | No |
| Item Dimensions LxWxH | 0.79 x 1.57 x 1.57 inches |
| Item Weight | 2.96 ounces |
| Item model number | NF-A4x205VPWM |
| Manufacturer | Noctua |
| Material | Fibre-glass reinforced PBT |
| Maximum Rotational Speed | 5000 RPM |
| Noise Level | 14.9 Decibels |
| Number of Items | 1 |
| Power Connector Type | 4-Pin |
| Product Dimensions | 1.57"L x 0.79"W x 1.57"H |
| Voltage | 5 Volts |

## 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

![NF-A4x20 5V PWM, Premium Quiet Fan, 4-Pin, 5V Version (40x20mm, Brown) - Image 1](https://m.media-amazon.com/images/I/71lyRpVR4OL.jpg)

## Available Options

This product comes in different **Size, Style** options.

## 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

### ⭐⭐⭐⭐⭐ Best fans money can buy
*by B***. 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.

### ⭐⭐⭐⭐⭐ 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).

### ⭐⭐⭐⭐⭐ 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)
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*Product available on Desertcart Kyrgyzstan*
*Store origin: KG*
*Last updated: 2026-03-01*