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🛠️ Upgrade your gear with the quiet power of Noctua — because your tech deserves premium airflow without the noise!
The Noctua NF-A4x20 5V is a premium 40mm quiet fan engineered for professional-grade cooling in compact devices. Operating at 5000 RPM with an ultra-low noise level of 14.9 dB(A), it features advanced aerodynamic design and comes with anti-vibration mounts and versatile adapters. Ideal for 1U servers, network switches, NAS, and other 5V industrial applications, it offers exceptional reliability with a mean time to failure exceeding 150,000 hours.
| ASIN | B072Q3CMRW |
| Best Sellers Rank | #152,050 in Computers ( See Top 100 in Computers ) #1,395 in Computer Case Fans |
| Brand | Noctua |
| Brand Name | Noctua |
| Compatible Devices | Desktop |
| Compatible devices | Desktop |
| Cooling Method | Air |
| Cooling method | Air |
| Customer Reviews | 4.8 out of 5 stars 378 Reviews |
| Item Dimensions L x W x H | 40L x 40W x 20H millimeters |
| Manufacturer | Noctua |
| Material Type | Fibre-glass reinforced PBT |
| Maximum Rotational Speed | 5000 RPM |
| Model | NF-A4x20 5V |
| Noise Level | 14.9 Decibels |
| Number of Items | 1 |
| Part Number | NF-A4x20 5V |
| Power Connector Type | 3-Pin |
| Power connector type | 3-Pin |
| Product dimensions | 40L x 40W x 20H millimeters |
| UPC | 841500110123 |
| Unit Count | 1.0 Count |
| Voltage | 5 Volts |
A**A
Good airflow, quiet, omnijoin adapter is good, overkill box
I used the noctua fan to replace a loud fan in a network switch. The OmniJoin adapter that was included was easily usable and works well. I had to use the anti-vibration fan connectors because the previous fan screw holes were smaller than the noctua fan screw holes. The anti-vibration fan connectors were installed and trimmed, but the network switch case didn't fit properly over the anti-vibration fan connectors. It had to be shoved on, but it worked out. The fan moves a good amount of air, but not as much as the original fan. This is still enough air to keep the switch cool, while being fairly quiet. The fan is still audible (at 5v constant, non-PWM), but I believe this is mostly due to the design of the case, not the fan's fault. The box is a bit overkill and has great presentation, but I would rather the item cost less than have a fancy box. Overall, this is a great product and can make most server gear into home gear. There isn't much for competition of noctua's 40mm quiet fans, so you kind of have to deal with noctua's high prices if you need a quiet 40mm fan.
A**R
Work great and very quiet
Work great cooling my bit axe solo miners
N**X
Excellent fan, but not for bitaxe
Love Noctua. I bought this to replace my high RPM fan on my Bitaxe gamma, since the stock fan is so loud (7000rpm). However, it does not meet the performance required to sufficiently cool the Bitaxe at 5000rpm. There is also a PWM version but it's also not recommended since you will likely have to put the fan to 100% anyways. Great fan, great company - just did not work for my specific application.
R**Y
Quiet and works well.
Very quiet and works great for an NVIDIA K80.
N**A
Whisper quiet and great airflow.
The product arrived quickly and was well packaged. I purchased this fan to cool down a Raspberry pi B+ which I’m using as a light weight desktop for an entertainment system. The only problem I had encountered is that in certain circumstances the pi would overheat and start to throttle the processor back to cool it down. With this fan running which is barely audible, it cools the Raspberry pi down to 27.8C on idle and I haven’t seen it go up higher than 48C while running as much stuff in the background to push that processor. All in all great fan and I would recommend it to anyone who requires good airflow and quiet operation for their cooling requirements.
Trustpilot
2 weeks ago
3 days ago