Noctua NF-A4x10 PWM, Premium Quiet Fan, 4-Pin (40x10mm, Brown)
Bottom line: The Noctua NF-A4x10 PWM ($15.95 on Amazon as of 2026-10-21 16:28 UTC): Just 19.6 dB(A) at max 5000 RPM, quiet enough for a homelab in a living space; main trade-off: brown and beige color scheme clashes with most black or RGB builds.
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*Price sourced from Amazon.com. Last updated 2026-10-21. Price and availability subject to change.
Pros & Cons
Pros
- ✓ Just 19.6 dB(A) at max 5000 RPM, quiet enough for a homelab in a living space
- ✓ 4-pin PWM gives automatic 1000-5000 RPM control from a motherboard or appliance header
- ✓ OmniJoin adaptor set splices into proprietary headers most 40mm fans cannot use
- ✓ Over 150,000 hours MTTF rating for always-on NAS, switch, and server duty
Cons
- ✗ Brown and beige color scheme clashes with most black or RGB builds
- ✗ 10mm thickness moves less air than the 20mm NF-A4x20 in the same footprint
- ✗ Low-Noise Adaptor trades top-end airflow for quiet, capping the fan at 3700 RPM
- ✗ 40mm frame at 5000 RPM still produces audible high-pitch tone in open air
Manufacturer description
The Noctua NF-A4x10 PWM is a 40x40x10mm quiet fan built for the places a stock fan screams: 1U servers, NAS enclosures, network switches, routers, and DVRs. Noctua's A-series design pairs Flow Acceleration Channels with an Advanced Acoustic Optimisation frame, so you get usable static pressure across a broad 1000-5000 RPM PWM range while topping out at just 19.6 dB(A). Because it is a true 4-pin PWM fan, your motherboard or appliance header can throttle it automatically instead of parking it at full tilt, and the bundled Low-Noise Adaptor caps it at 3700 RPM when you want near-silence over…
SpecPicks Verdict
SpecPicks scored Noctua NF-A4x10 PWM using a rating × review-volume × price-fit model applied to published specs and reviews across the PC & gaming hardware category. Noctua's PC & gaming hardware 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 PC & gaming hardware 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
How loud is the Noctua NF-A4x10 PWM at full speed?
Noctua rates it at a maximum of 19.6 dB(A) at its top speed of 5000 RPM. The included Low-Noise Adaptor caps the fan at 3700 RPM for a quieter profile.
Will this fan fit my 1U server or NAS?
It is a standard 40x40x10mm frame, so it drops into any 40mm mount with 10mm of depth clearance. Noctua lists 1U servers, routers, switches, NAS units, and DVRs as target applications.
Does it work with a 3-pin header or a proprietary connector?
It is a 4-pin PWM fan, but the included OmniJoin adaptor set lets you splice it onto proprietary fan headers. On a 3-pin header it runs without PWM speed control.
What comes in the box?
Anti-vibration mounts, fan screws, a Low-Noise Adaptor, an extension cable, and the OmniJoin adaptor set, alongside the fan itself.
Is it reliable enough for 24/7 operation?
Noctua rates it at more than 150,000 hours MTTF, which targets continuous-duty gear. Check the product listing for current warranty terms.
What is the speed range of the NF-A4x10 PWM?
PWM control covers roughly 1000 to 5000 RPM. With the supplied Low-Noise Adaptor installed the ceiling drops to about 3700 RPM.
Key Features
- Premium quiet fan, 40x40x10 mm, 12V, 4-pin PWM, max. 5000 RPM, max. 19.6 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
- 40x10mm size ideal for 1U servers or replacing fans in network and storage equipment (routers, switches, NAS etc.) or other devices such as DVRs
- 4-pin PWM version for automatic speed control via 4-pin PWM fan headers, broad 1000-5000rpm speed range (3700rpm max. with supplied Low-Noise Adaptor)
- Includes anti-vibration mounts, fan screws, Low-Noise Adaptor, extension cable and OmniJoin adaptor set for connecting the fan to proprietary fan headers
Full Specifications
| Brand | Noctua |
|---|---|
| Model | NF-A4x10 PWM |
| Voltage | 12 Volts |
| Material | Fibre-glass reinforced PBT |
| Dimensions | 40x40x10 mm |
| Unit Count | 1.0 Count |
| Noise Level | 19.6 Decibels |
| Part Number | NF-A4x10 PWM |
| Material Type | Fibre-glass reinforced PBT |
| Cooling Method | Air |
| Item Type Name | Fan |
| Number of Items | 1 |
| Vibration/Rumble | Yes |
| Compatible Devices | Desktop |
| Included Components | Noctua NF-A4x10 PWM, High-end Silent Fan |
| Power Connector Type | 4-Pin |
| Warranty Description | 6 year manufacturer’s warranty |
| Maximum Rotational Speed | 5000 RPM |
| Item Dimensions L x W x H | 1.57"L x 1.57"W x 0.39"H |
| Global Trade Identification Number | 00841501110443, 09010018100440 |
Ready to buy?
Noctua NF-A4x10 PWM, Premium Quiet Fan, 4-Pin (40x10mm, Brown) 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 2026-10-21. Price and availability subject to change.
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