Noctua

Noctua NF-A6x25 FLX Fan

Name: Noctua NF-A6x25 FLX Fan - 60mm NF-A6X25 FLX, Computer case, NF-A6X25_FLX (NF-A6X25 FLX, Computer case, Fan, 6 cm, 1600 RPM, 3000 RPM, 19.3 dB)
Brand: Noctua
SKU: B009LEKGGE

Status: Noctua NF-A6x25 FLX Fan - 60mm NF-A6X25 FLX: Unavailable on Amazon as of 2026-10-21 16:14 UTC. SpecPicks has no in-stock listing with matching specs on file; the search below lists current offers. eBay sellers may still list this model new or used.

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Bottom line: The Noctua NF-A6x25 FLX Fan: Wide 1600-3000 RPM range via bundled Low-Noise Adaptors; main trade-off: 3-pin FLX version has no PWM motherboard speed control.

Unavailable on Amazon as of 2026-10-21 16:14 UTC

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By Mike Perry, Founder & Editor-in-Chief · Listing data updated 2026-10-21

Mike Perry — Hardware researcher since 2014, focused on GPU performance across gaming, rendering, and local-LLM inference. Synthesises community benchmarks, manufacturer specs, and public forum data into actionable buying guides. About the author →

Pros & Cons

Pros

✓ Wide 1600-3000 RPM range via bundled Low-Noise Adaptors
✓ 19.3 dB(A) at the 1600 RPM setting - quiet enough for a desk
✓ 60mm size fits server, NAS, and retro PC vents larger fans cannot
✓ Standard 60x60x25mm frame drops into existing brackets

Cons

✗ 3-pin FLX version has no PWM motherboard speed control
✗ Beige and brown color scheme clashes with most modern builds
✗ 60mm frame moves far less air than a 120mm fan
✗ Speed changes require physically swapping adaptor cables

Manufacturer description

The Noctua NF-A6x25 FLX solves a problem most case fans ignore: what to do when you only have a 60mm mounting hole. This 6 cm frame packs Noctua's AAO housing and Flow Acceleration Channels into a footprint small enough for compact server chassis, retro PC builds, NAS enclosures, 3D printer electronics bays, and amplifier cabinets. Out of the box it spins at up to 3000 RPM for maximum static pressure, and the bundled Low-Noise Adaptors step it down to 1600 RPM at 19.3 dB(A) when you would rather not hear it. That range is the point: you pick where the fan sits between airflow and silence…

SpecPicks Verdict

SpecPicks scored Noctua NF-A6x25 FLX Fan using a rating × review-volume × price-fit model applied to published specs and reviews across the pc cases category. Noctua's pc cases 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 cases 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-A6x25 FLX?

It is rated 19.3 dB(A) at the 1600 RPM setting reached with the included Low-Noise Adaptor. Running unrestricted at its full 3000 RPM is noticeably louder, so most buyers use an adaptor for desk-side machines.

Will this fit a 60mm fan slot?

Yes. It is a 6 cm (60mm) fan in the standard 25mm-thick frame, so it matches 60x60x25mm mounting patterns found in small cases, NAS units, and older PC chassis.

Is the FLX version PWM controlled?

No. FLX is the 3-pin voltage-based model, and speed is set with the bundled Low-Noise Adaptor cables rather than a motherboard PWM curve. Look at Noctua's PWM variant if you need software fan curves.

How fast does it spin?

Up to 3000 RPM at full speed, or 1600 RPM with the Low-Noise Adaptor installed. That gives you a high-static-pressure setting for restricted vents and a quiet setting for everyday use.

Is it worth the price over a generic 60mm fan?

For anything you sit near or leave running around the clock, the 19.3 dB(A) rating is what you are paying for. Check the product listing for current price and warranty terms.

Key Features

NF-A6X25_FLX

Full Specifications

Brand	Noctua
Model	NF-A6X25 FLX
Voltage	12 volts
Material	Copper
Unit Count	1 Count
Noise Level	19.3 db
Part Number	NF-A6X25 FLX
Material Type	Copper
Cooling Method	Air
Number of Items	1
Compatible Devices	Desktop
Power Connector Type	3-Pin
Maximum Rotational Speed	2400 rpm
Item Dimensions L x W x H	2.36"L x 0.98"W x 2.36"H
Global Trade Identification Number	04716123314707
Full listing title	Noctua NF-A6x25 FLX Fan - 60mm NF-A6X25 FLX, Computer case, NF-A6X25_FLX (NF-A6X25 FLX, Computer case, Fan, 6 cm, 1600 RPM, 3000 RPM, 19.3 dB)

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