Noctua
Noctua NF-A4x10 5V
Bottom line: The Noctua NF-A4x10 5V ($15.95 on Amazon as of 2026-10-07): 17.9 dB(A) at full 4500 RPM tilt keeps small enclosures genuinely quiet; main trade-off: 5V-only version, not usable on 12V PC motherboard headers.
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*Price sourced from Amazon.com. Last updated 2026-10-07. Price and availability subject to change.
Pros & Cons
Pros
- ✓ 17.9 dB(A) at full 4500 RPM tilt keeps small enclosures genuinely quiet
- ✓ 10mm slim depth fits DVR, NAS and switch chassis that reject 20mm fans
- ✓ OmniJoin adaptor set splices into proprietary headers other fans cannot use
- ✓ Rated >150,000 hours MTTF for equipment that runs continuously
Cons
- ✗ 5V-only version, not usable on 12V PC motherboard headers
- ✗ 40mm frame moves limited air compared with 80mm or 120mm fans
- ✗ 3-pin Molex means no PWM speed control from the host device
- ✗ OmniJoin splicing requires cutting the original fan cable
Manufacturer description
The Noctua NF-A4x10 5V is a 40x40x10mm slim fan built for equipment that runs on a 5V 3-pin header rather than a PC motherboard. It spins at 4500 RPM while measuring 17.9 dB(A), so it moves air through tight enclosures without the whine that stock 4cm fans are known for. Noctua's A-series frame adds Flow Acceleration Channels and Advanced Acoustic Optimisation, two design elements aimed at cutting turbulence noise at the blade tips. With a rated MTTF above 150,000 hours, this Noctua fan is meant to outlast the device you install it in. If you are replacing a failing or screaming fan in a 3D…
SpecPicks Verdict
SpecPicks scored Noctua NF-A4x10 5V using a rating × review-volume × price-fit model applied to published specs and reviews across the retro cpu coolers & fans category. Noctua's retro cpu coolers & fans lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.
Common buyer scenarios for retro cpu coolers & fans of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.
Frequently Asked Questions
Will this fan work in my PC case?
No. This is the 5V version rated for 4500 RPM on 5V 3-pin power, and Noctua specifies it should not be run at 12V, which is what standard PC motherboard fan headers supply. Choose the 12V NF-A4x10 variant for PC builds.
How loud is the Noctua NF-A4x10 5V?
It is rated at 17.9 dB(A) at its full 4500 RPM speed. That figure is for the fan at maximum output, so it does not depend on a speed controller to stay quiet.
What are the exact dimensions?
40 x 40 x 10 mm. The 10mm depth is the slim profile, which is half the thickness of a standard 20mm 40mm fan, so it fits enclosures where a thicker fan will not clear.
What if my device has an odd fan connector?
The included OmniJoin adaptor set is made for exactly that. It lets you splice the Noctua onto proprietary fan headers found in 3D printers, DVRs and network gear. Anti-vibration mounts, screws, and an extension cable are also in the box.
What does Noctua rate this fan to last?
Noctua lists an MTTF of more than 150,000 hours, which is aimed at devices like NAS units and routers that stay powered on around the clock. Check the product listing for current warranty terms.
Key Features
- Premium quiet fan, 40x40x10 mm, 5V, 3-pin Molex, 4500 RPM, 17.9 dB(A), >150,000 h MTTF
- Award-winning 40x10mm A-series fan with Flow Acceleration Channels and Advanced Acoustic Optimisation frame for superior quiet cooling performance
- Ideal replacement for noisy or broken 5V 4cm fans in 3D printers, DVRs, NAS, switches, routers, other network and storage devices, etc.
- 3-pin 5V version with 4500rpm, not to be used at 12V (such as in PC environments)
- Includes anti-vibration mounts, fan screws, extension cable and OmniJoin adaptor set for connecting the fan to proprietary fan headers
Full Specifications
| Brand | Noctua |
|---|---|
| Model | NF-A4x10 5V |
| Voltage | 5 volts |
| Material | Fibre-glass reinforced PBT |
| Dimensions | 40x40x10 mm |
| Unit Count | 1 Count |
| Noise Level | 17.9 db |
| Part Number | NF-A4x10 5V |
| Compatibility | PC |
| Material Type | Fibre-glass reinforced PBT |
| Cooling Method | Air |
| Number of Items | 1 |
| Number of Packs | 1 |
| Vibration/Rumble | Yes |
| Compatible Devices | Desktop |
| Power Connector Type | 3-Pin |
| Warranty Description | 6 year manufacturer’s warranty |
| Maximum Rotational Speed | 4500 rpm |
| Item Dimensions L x W x H | 1.57"L x 1.57"W x 0.39"H |
| Global Trade Identification Number | 04716123315469 |
| Full listing title | Noctua NF-A4x10 5V, High-Performance Quiet Fan 40mm | High Airflow Low Noise, 5V, 10mm Slim Fan, for Ventilation and Electronics Cooling, With OmniJoin Adaptor, 4500rpm 3-Pin |
Ready to buy?
Noctua NF-A4x10 5V, High-Performance Quiet Fan 40mm | High Airflow Low Noise, 5V, 10mm Slim Fan, for Ventilation and Electronics Cooling, With OmniJoin Adaptor, 4500rpm 3-Pin is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.
*Price sourced from Amazon.com. Last updated 2026-10-07. Price and availability subject to change.
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