Noctua NF-S12A PWM, FLX, ULN Premium Case Fan Review

Published on March 20th, 2014

Fans are an essential part of every desktop PC. It cools your system, it sucks in cool air and exhaust heat produced by the PC components. But fans are not made alike. There are stock fans, there are premium fans and the noisy high performance fans. Today let’s take a look at the Noctua NF-S12A fan series, a 120mm premium case fan offering super silent case cooling. The NF-S12A has three variants, the PWM, the FLX and ULN. Let’s get to more about them below and find out if this would be your next case fan.


Noctua NF S12A PWM FLX ULN Case Fan Review

The Noctua NF-S12A Fans consist of three different types, the PWM or Pulse With Modulation, the FLX or the Flexible variant, and the ULN or Ultra Low Noise variant. The NF-S12A PWM, just like any other PWM fans, can automatically adjust its fan speed depending on the temperature. You don’t need any fan controller or adapter to adjust its speeds. Meanwhile, the NF-S12A FLX on the other hand has a constant speed, and you need to use the Low Noise Adapter or Ultra Low Noise adapter (which is included in the package) to set the desired fan speed. And the last is the NF-S12A ULN, which is the most silent amongst the three.

All the three fans in the Noctua NF-S12A series feature Anti-Stall Knobs in their fan blades, together with the Advanced Acoustic Optimization Frame or AAO Frame which improves the airflow and lowers the noise. It also features Stepped Inlet Design, Inner Surface Microstructures, SSO2 Bearing, a Metal Bearing shell and integrated anti-vibration pads. But only the PWM variant features Noctua’s very own NE-FD1 PWM IC that integrates Smooth Commutation Drive technology for quieter operation and allows for ulta-low power consumption. Now let’s take a look at the detailed specifications on each fan in the table below, and after that we will have a closer look on the NF-S12A fans themselves.

Noctua NF-S12A PWM, FLX, ULN Specifications

SpecificationsNF-S12A PWMNF-S12A FLXNF-S12A ULN
Size120x120x25 mm120x120x25 mm120x120x25 mm
Connector4-pin PWM3-pin3-pin
Blade GeometryS-Series with Anti-Stall KnobsS-Series with Anti-Stall KnobsS-Series with Anti-Stall Knobs
Frame TechnologyAAO (Advanced Acoustic Optimisation)AAO (Advanced Acoustic Optimisation)AAO (Advanced Acoustic Optimisation)
Rotational Speed (+/- 10%)1200 RPM1200 RPM800 RPM
Rotational Speed with L.N.A. (+/- 10%)900 RPM900 RPM600 RPM
Min. Rotational Speed (PWM, +/-20%)300 RPM700 RPM
Airflow107,5 m³/h107,5 m³/h74,3 m³/h
Airflow with L.N.A.83,2 m³/h83,2 m³/h57,5 m³/h
Airflow with U.L.N.A.65,8 m³/h
Acoustical Noise17,8 dB(A)17,8 dB(A)8,6 dB(A)
Acoustical Noise with L.N.A.10,7 dB(A)10,7 dB(A)6,7 dB(A)
Acoustical Noise with U.L.N.A.7,4 dB(A)
Static Pressure1,19 mm H2O1,19 mm H2O0,62 mm H2O
Static Pressure with L.N.A.0,73 mm H2O0,73 mm H2O0,44 mm H2O
Static Pressure with U.L.N.A.0,51 mm H2O
Max. Input Power1,44 W1,44 W0,72 W
Max. Input Current0,12 A0,12 A0,06 A
Voltage12 V12 V12 V
MTBF> 150.000 h> 150.000 h> 150.000 h
Warranty6 years6 years6 years
Scope of DeliveryLow-Noise Adaptor (L.N.A.)
4-Pin Y-Cable
30cm Extension Cable
4 Vibration-Compensators
4 Fan Screws
Low-Noise Adaptor (L.N.A.)
Ultra-Low-Noise Adaptor (U.L.N.A.)
3:4-Pin Adaptor
30cm Extension Cable
4 Vibration-Compensators
4 Fan Screws
Low-Noise Adaptor (L.N.A.)
3:4 Pin Adaptor
30cm Extension Cable
4 Vibration-Compensators
4 Fan Screws

As you can see from the table above, the PWM and the FLX variant has the highest rotational speed, meaning it produce more air pressure than the ULN variant. But the ULN variant, despite its low air pressure, is the most silent amongst the three and consumes lesser power as well. Now let’s take a closer look on the NF-S12A’s packing and the fans themselves.

A Closer Look

Noctua NF-S12A review-001 Noctua NF-S12A review-003 Noctua NF-S12A review-002
The Noctua NF-S12A features a very nice packaging. I own several premium and branded fans, but Noctua’s packaging is better. The box of the fans has a flip covering on both sides. The flip contains a detailed explanation about the fan’s features. Everything you need to know about the fan can be found in the box. You also get to see the NF-S12A’s fan blades through the see-through plastic covering together with three anti-vibration rubber bolts (there are actually four, the other one is just hidden).

Noctua NF-S12A review-004 Noctua NF-S12A review-006

When you get a Noctua NF-S12A premium case fan, you also get a set of accessories, depending on the type of fan that you got. Basically there are four anti-vibration bolts, four case fan screws, and several adapters like the Low Noise Adapter and Ultra Low Noise Adapter.

Noctua NF-S12A review Noctua NF-S12A review-005

The Noctua NF-S12A fans sports the brown and light flesh color theme. All of Noctua’s fans have this color theme and it has become a trademark of their product. One look at the fan and you’ll now it’s a Noctua fan. If you noticed there are three tiny bumps on each fan blades. They are the Anti-Stall Knobs that reduces flow separation phenomena in medium to high impedance situations and thus increase the fan’s stall margin. If you noticed there are also lots of small dents in the frame of the NF-S12A, these are the Inner Surface Microstructures. They reduce the blade passing noise and improved airflow and pressure efficiency

Noctua NF-S12A review-009 Noctua NF-S12A review-008 Noctua NF-S12A review-007
Here are pictures of the rear portion of the fans. There are no stickers or anything on the flan blades that might affect its performance. Instead Noctua, placed its logo on the rear covering. You can also tell what type of fan it is via the printed name on its back, and other information such as the fan’s voltage, wattage and amperes.

Noctua NF-S12A review-011 Noctua NF-S12A review-012

The Noctua NF-S12A also features an Advanced Acoustic Optimization Frame (AAO Frame for short) that has integrated anti-vibration pads, as well as Noctua’s proprietary Stepped Inlet Design and Inner Surface Microstructures, both of which further refine the fan’s performance/noise efficiency. The cords of the NF-S12A fans are also covered with braided covering that are sealed with heat shrink tubes at the ends. Some of you might not want the color scheme, but the build quality of these NF-S12A fans are truly a work of superb craftsmanship.

Noctua NF-S12A review-014 Noctua NF-S12A review-013

With each Noctua NF-S12A premium fan you get a certain set of accessories. The only common accessory are the anti-vibration rubber bolts and case fan screws. For the NF-S12A PWM you get an extension cable, a Y cable and a Low Noise Adapter. For the NF-S12A FLX you get an extension cable, Low Noise adapter, Ultra Low Noise adapter and a 3:4-pin adapter. And for the NF-S12A ULN, you get an extension cable, Ultra Low Noise adapter and a 3:4-pin adapter. The FLX variant has more connectors since you can manually control its fan’s speed via the adapters.


In testing the Noctua NF-S12A I used the following setup:

Operating System: Windows 8 Pro 64-bit
Motherboard: Asus P8H67-M EVO
Processor: Core i5-2500K
CPU Cooler: Promilatech Megashadow
Memory: 2x 4GB G.Skill RipJaws X and 1x 4GB Corsair Vengeance (total 12GB)
Graphics card: Asus ROG Poseidon GTX 780 Platinum
Hard Drive: Samsung 830 128GB for the OS
Power Supply: Corsair HX650 80 Plus Gold
Case: Cooler Master HAF XM

Noctua NF-S12A review-016 Noctua NF-S12A review-017 Noctua NF-S12A review-018

As you can see from the setup above, the Noctua NF-S12A stands out from the rest of the components. The Noctua NF-S12A is not a high performance fan, and honestly I could throw in low temperatures in this review to impress you about its performance. But I don’t do that, what I experience with every product that I review is also what I report. The NF-S12A isn’t a high performance fan. Instead they focused on aesthetics and low noise operation.

Noctua NF-S12A as a Case Fan
The PWM, FLX and ULN can be perfectly used as a case fan. The PWM and FLX are already silent fans, but if you really want something that is ultra-quite, then use the ULN variant. When compared to a stock fan, the PWM and FLX perform better at 1,200 RPM. But don’t expect the ULN to perform way better than some stock fans. The ULN is all about silence. I couldn’t hear anything at all coming out from this the ULN fan. And I could also feel that the air pressure is pretty much weak compared to the PWM and FLX.

Noctua NF-S12A as a CPU Cooler Fan
I would not recommend that you use the ULN variant since it doesn’t produce much airflow unlike the PWM and FLX. The FLX is a good fan, but it runs on constant speed. Unless you have a fan controller, you can only control the fan speed by using the adapter included in the package. Obviously the NF-S12A PWM is the best option when you want to use it for CPU cooling. In idle modes, the PWM adjusts automatically to lower fan speeds. Meanwhile it goes up to 1200 RPM when temperature starts to rise.

Now for users who overclocks their CPU regularly or if you want to do some benchmarks, I wouldn’t recommend that you use the NF-S12A to cool your CPU heatsink. You will need a high performance fan, like the Noctua NF-F12. This fan is really designed to cool heatsinks and radiators. I just hope we can have samples of the NF-F12 soon.

Noctua NF-S12A Review: Conclusion

Noctua has done a really good job with the 120mm fans. They pay attention to every detail and the craftsmanship of their products. The Noctua NF-S12A premium case fan is a great replacement for stock case fan. They perform better (and may even look better) than stock fans, plus they are extremely quite during operation. The NF-S12A PWM can also be used to cool CPU heatsinks (or even 120mm / 240mm radiators). But use them only if you are not overlocking your CPU or if your system is not in a high performance state. Otherwise, the fan will have difficulty cooling the heatsink. If you do overclocking or your system is always on high performance mode, I would recommend that you use the Noctua NF-F12 instead. Another plus factor about the NF-S12A is that since they operate on lower RPMs, they consume less power. For people who are looking for an energy efficient fan, the NF-S12A series is definitely a fan you must consider.

Currently the PWM and the FLX variant sells for $21.99 and $21.49 respectively, while the ULN variant is $19.19 USD. Meanwhile, the high performance NF-F12 is also priced at $21.99, same with the PWM variant. These fans are available and you can order them with free shipping via the links below.

  • Noctua NF-S12A ULN $19.19 with free shipping.
  • Noctua NF-S12A FLX $21.49 with free shipping.
  • Noctua NF-S12A PWM $21.99 with free shipping.
  • Noctua NF-F12 PWM $21.99 with free shipping.

Meanwhile, in the Philippines, the Noctua NF-S12A series is priced around Php 1,000 which is somewhat more expensive compared to other fans, even high performance fans. But these are premium fans, and you get a certain amount of bragging rights with Noctua products.

Overall, the Noctua NF-S12A is great premium case fan. I know some of you don’t like its color, but I would not even suggest that you spray paint it either. Painting it would defeat its design’s purpose and might cause imbalance to the fan blades. Until now, I use the ULN for rear exhaust and the PWM and FLX for air intake. Aside from the ultra-silent operation, the Noctua NF-S12A is also back with 6 years warranty, making this fan worthy of the PC Enthusiast’s Editor’s Choice award.

noctua nf-s12a editor's choice award

Note: This Noctua NF-S12A PWM, FLX, ULN Premium Case Fan Review first appeared on ThePCEnthusiast, and was republished here by the reviewer.

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