Noctua
Noctua NF-S12A FLX, Premium Quiet Fan, 3-Pin (120mm, Brown)
Bottom line: The Noctua NF-S12A FLX ($21.95 on Amazon as of 2026-11-07 13:20 UTC): Max noise of just 17.8 dB(A) at full 1200 RPM; main trade-off: 3-pin only, no PWM; auto speed control needs motherboard voltage control.
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*Price sourced from Amazon.com. Last updated 2026-11-07. Price and availability subject to change.
Pros & Cons
Pros
- ✓ Max noise of just 17.8 dB(A) at full 1200 RPM
- ✓ Three fixed speeds (1200/900/700 RPM) via included adaptors, no software needed
- ✓ Rated for more than 150,000 hours MTTF
- ✓ Anti-vibration mounts included to cut chassis-transmitted hum
- ✓ 3:4-pin adaptor lets you power it directly from the PSU
Cons
- ✗ 3-pin only, no PWM; auto speed control needs motherboard voltage control
- ✗ 1200 RPM ceiling moves less air than higher-speed 120mm fans
- ✗ Brown color scheme can clash with black or RGB builds
- ✗ Airflow-optimised for case ventilation, not marketed for radiators
Manufacturer description
The Noctua NF-S12A FLX is a 120x120x25 mm 3-pin case fan built for one job: moving air through your PC with as little noise as possible. This third-generation S12 design pairs an Advanced Acoustic Optimisation frame with Anti-Stall Knobs. Its airflow-optimised blades suit both intake and exhaust positions, plus cabinet and other chassis cooling. The FLX version gives you three speed settings without any software. Run it at its full 1200 RPM for maximum airflow, or add the included Low-Noise Adaptor (900 RPM) or Ultra-Low-Noise Adaptor (700 RPM) for near-silent operation. At top speed, noise…
SpecPicks Verdict
SpecPicks scored Noctua NF-S12A FLX using a rating × review-volume × price-fit model applied to published specs and reviews across the cooling & fans category. Noctua's cooling & 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 cooling & 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
How loud is the Noctua NF-S12A FLX at full speed?
Noctua specifies a maximum of 17.8 dB(A) at the top 1200 RPM setting. With the Low-Noise (900 RPM) or Ultra-Low-Noise (700 RPM) adaptor installed, it runs even quieter.
Does the NF-S12A FLX support PWM control?
No. It is a 3-pin fan. You set speed with the included adaptors (1200, 900 or 700 RPM), or through a motherboard header that supports voltage (DC) fan control.
Can I connect it directly to my power supply?
Yes. The box includes a 3:4-pin adaptor for powering the fan straight from a PSU 4-pin connector, plus an extension cable for longer cable runs.
What size is this fan and will it fit my case?
It measures 120x120x25 mm, the standard 120mm fan size, so it fits any 120mm fan mount with room for a 25 mm thick fan. Use it for intake or exhaust.
What comes in the box?
Along with the fan, you get anti-vibration mounts, fan screws, a Low-Noise Adaptor, an Ultra-Low-Noise Adaptor, an extension cable and a 3:4-pin adaptor. Check the listing for current warranty terms.
Key Features
- Premium quiet fan, 120x120x25 mm, 12V, 3-pin Molex, 1200/900/700 RPM, max. 17.8 dB(A), >150,000 h MTTF
- Award-winning third-gen 120x25mm S12 fan with Anti-Stall Knobs and Advanced Acoustic Optimisation frame for superior quiet cooling performance
- Airflow-optimised design for highly efficient, near-silent ventilation of PC cases and other chassis (intake & exhaust), cabinet cooling, etc.
- 3-pin FLX version provides 1200/900/700rpm speed settings via Low-Noise Adaptors to fine-tune the fan for maximum airflow or near-silent operation
- Includes anti-vibration mounts, fan screws, Low-Noise & Ultra-Low-Noise Adaptors, extension cable and 3:4-pin adaptor for powering the fan directly from the power supply
Full Specifications
| Brand | Noctua |
|---|---|
| Model | NF-S12A FLX |
| Voltage | 12 Volts |
| Material | Fibre-glass reinforced PBT |
| Dimensions | 120x120x25 mm |
| Unit Count | 1.0 Count |
| Noise Level | 17.8 Decibels |
| Part Number | NF-S12A FLX |
| Compatibility | PC |
| Material Type | Fibre-glass reinforced PBT |
| Cooling Method | Air |
| Number of Items | 1 |
| Vibration/Rumble | Yes |
| Air Flow Capacity | 107.5 Cubic Meters Per Hour |
| Compatible Devices | Desktop |
| Power Connector Type | 3-Pin |
| Warranty Description | 6 year manufacturer’s warranty |
| Maximum Rotational Speed | 1200 RPM |
| Item Dimensions L x W x H | 4.72"L x 4.72"W x 0.98"H |
| Global Trade Identification Number | 00132017920658, 00842431014238 |
Benchmark data for other processors
Ready to buy?
Noctua NF-S12A FLX, Premium Quiet Fan, 3-Pin (120mm, 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 2026-11-07. Price and availability subject to change.
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