--- product_id: 43512932 title: "Noctua NF-A4x20 5V PWM, Premium Quiet Fan, 4-Pin, 5V Version (40x20mm, Brown)" brand: "noctua" price: "€ 35.58" currency: EUR in_stock: true reviews_count: 13 category: "Noctua" url: https://www.desertcart.hr/products/43512932-noctua-nf-a4x20-5v-pwm-premium-quiet-fan-4-pin store_origin: HR region: Croatia --- # >150,000 h MTTF lifespan 5000 RPM max speed Ultra-quiet 14.9 dB(A) noise level Noctua NF-A4x20 5V PWM, Premium Quiet Fan, 4-Pin, 5V Version (40x20mm, Brown) **Brand:** noctua **Price:** € 35.58 **Availability:** ✅ In Stock ## Summary > 🛠️ Cool smarter, not louder — the fan your tech deserves. ## 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?** € 35.58 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/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 - • **Compact Powerhouse:** Sized at 40x40x20mm, perfectly engineered for 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 at 5V. - • **Whisper-Quiet Cooling:** Experience near-silent airflow with industry-leading 14.9 dB(A) noise levels—because your workspace deserves peace. - • **Durability Meets Design:** Award-winning A-series frame with Flow Acceleration Channels ensures superior airflow and longevity beyond 150,000 hours. - • **Complete Installation Kit:** Includes anti-vibration mounts, extension cables, and OmniJoin adaptors for seamless integration and vibration-free operation. ## Overview The Noctua NF-A4x20 5V PWM is a premium, ultra-quiet 40x40x20mm fan designed for 5V applications requiring precise PWM speed control. With a max speed of 5000 RPM and noise levels as low as 14.9 dB(A), it delivers efficient cooling in compact spaces like mini PCs, network devices, and 1U servers. Its award-winning aerodynamic design and robust build promise over 150,000 hours of reliable operation, complemented by a comprehensive mounting and connection kit for hassle-free installation. ## 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: 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 | #234 in Computer Case Fans | | Brand | Noctua | | Brand Name | Noctua | | Compatible Devices | Desktop | | Cooling Method | Air | | Customer Reviews | 4.8 out of 5 stars 933 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) ## 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. ### ⭐⭐⭐⭐⭐ Louder than expected *by K***I on June 22, 2026* It's not super loud, but it is still quite annoying at full speed in a quiet room. It does have PWM though, but it is an additional bother to enable it on a Raspberry Pi and I kind of hoped it could be left on full without being noisy. ## 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 --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.hr/products/43512932-noctua-nf-a4x20-5v-pwm-premium-quiet-fan-4-pin](https://www.desertcart.hr/products/43512932-noctua-nf-a4x20-5v-pwm-premium-quiet-fan-4-pin) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-07-07*