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ARCTIC P12 PWM PST - PC Fan, 120mm Fan, PC Case Fan with PWM Sharing Technology (PST), Pressure-optimised, quiet motor, Computer, Fan Speed: 200-1800 rpm (0 rpm <5%) - Black

£9.9£99Clearance
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There are a few changes in the design department of these fans compared to the regular P12 PWM fans. ARCTIC has still retained the famous 5-blade design but this time around there is a ring attached to the tips of these blades making it one complete assembly. This ring is named Fan Wheel by ARCTIC and it serves the purpose of taking the hit from resistance force from the surface but ensuring that static pressure is maintained without losing airflow. The rotor itself is taller than average for a 15mm profile fan. Support with nylon filters is nevertheless maintained. The height difference between the frame and the rotor is sufficient at the fan intake, even if you use a filter with an unreinforced mesh. But the worse ones, which collapse significantly, can already collide as with all fans.

The connection is made via a 4-pin PWM connector. Arctic uses a high-quality, hydrodynamic plain bearing. This not only guarantees smooth operation, but also ensures that the volume does not increase over time.The P12 has larger blades compared to the BioniX P120, although it doesn’t seem like it unless one sees those fans side by side. So with the same size hub, the gaps between the blades are naturally smaller on the P12, so there is less room for airflow leakage and higher static pressure is achieved. This means that the airflow loss due to obstacle resistance is smaller with the P12 than with the P120.

One of the differences from the BioniX P120 A-RGB that is also good to notice when judging the results is the smaller offset of the rotor from the frame. The P12 has a half centimeter narrower tunnel, so the rotor is closer to the obstacle, which changes the airflow velocity in addition to the noise. So there is actually a similar effect that the Noctua NA-IS1 frame is supposed to provide. Unlike the P12 PWM fans which use Fluid Dynamic Bearings, the P12 MAX fans are using Double-Ball Bearings. We know that double ball bearings can handle the axial and radial loads in both directions which would mean installing these fans vertically or horizontally would not affect the performance in the long run and will provide durability. ARCTIC has employed bearings from Japanese manufacturer NMB. However, there is a catch. Running these fans at high speed would make more noise compared to fluid dynamic or sleeve bearing. These fans have MTTF of >500,000 hours thanks to these bearings. Due to sinus-magnetizing the new motor only creates about 5 % of the vibration from the commutation of a regular DC motor without a filter. Testing ARCTIC with their P12 PWM fans has been at an advantage when it comes to noise performance and we have seen that P12 MAX fans at roughly 50% of their speed are now doing what regular P12 PWM fans are doing at their full speed (100% PWM cycle). This has provided P12 MAX a thermal headroom of 3°C (as per our testing) coming from going above 50% PWM cycle. This is one way of doing it. We did not see any benefit of going below 43 B(A) as fans are silent at this range. This tells us that the thermal performance of P12 MAX fans is quite good albeit at a high noise output. There are many gen 3 nvme drives that outperform the cheap Gen 4 drives. Like my ignorance in buying an sn750se "gen 4"..... It's slower than the sn750 Gen 3 I was going to replace it with! Spend money on the things that matter. 1. PSU 2.mobo 3. The highest end CPU you can afford 4. A GPU that will leap frog the next gen(don't upgrade each release!) and last but not least.... Don't fall for the "PCI Express Gen 4" hype.

Die PWM-Funktion des Lüfters ist ein weiteres Highlight. Sie ermöglicht eine präzise Steuerung der Lüftergeschwindigkeit, basierend auf der aktuellen Temperatur im Gehäuse. Dadurch bleibt der Lüfter leise, wenn die Temperaturen niedrig sind, und dreht bei Bedarf automatisch schneller, um eine optimale Kühlung zu gewährleisten. Diese Funktion ist besonders praktisch, da sie den Lärmpegel meines Systems reduziert und Energie spart.

The signal quality of the motherboard/hub should not make a difference in noise, it is determined by the NE-FD1 IC inside the fan. Noctua often has complaints about the PWM signal quality of third party devices and states that it can be misinterpreted at lower speeds. But this is not the case with Noctua fans and it should not affect the noise level anyway, as long as the fan is running stable at the given speed. The misinterpretation of PWM that Noctua mentions is that the fan operation may not correspond to the set PWM duty cycle ( we have discussed this in more detail in this article, where we also discuss the key features of the new Noctua NA-FH1 hub). There are a lot of droning or downright rumbling fans out there, but none have been as popularized by this sound profile as the Arctic P12. Probably also because this acoustic deficiency is really pronounced here and has pushed the manufacturer to make design changes in newer models that are aimed at suppressing critical tonal peaks. But even so, the base model P12 PWM PST is a remarkable fan and is unbeatable in its price range.The anemometer was placed close to the fan. Since we measure all 120mm fans the same way, the error of margin would apply to all. Acoustic Starting out, it’s still worth noting that the Arctic P12 compares with the previously tested BioniX P120 A-RGB, although it has seemingly the same rotor – it doesn’t. And there are more than enough differences, including a shorter tunnel (P12) with less rotor clearance from an obstacle, but let’s start the analysis as usual from the top. Unfortunately, I cannot agree with this statement even now. The extra details that Noctua has often stand out more with relatively higher speeds. Whether it’s Flow Acceleration Channels, Stepped Inlet Design, a significant narrowing of the gap between the blade tips and the frame or Inner Surface Microstructures. These elements counteract the shortcomings that become stronger with increasing pressure. The fact that the NF-A12x25 gives excellent results at low speeds is largely due to the fact that the operation of the motor and blades does not create any noise, so at this level there are no such pronounced limitations as with other fans, and the NF-A12x25 fits into the same noise level at higher speeds. Now I know, 600 rpm, okay, and as a sign that I appreciate that we have such demanding readers, I promise you that sooner or later we will create another mode, which will be twice quieter than the quietest mode that we have now. In addition, we will select fans that will have the highest airflow in the 31 dBA mode and there will be room for further noise reduction. Some fans cannot be slowed down even to 31 dBA mode and of the remaining ones, half of them have a speed of 600 rpm or lower. The NF-A12x25 PWM here allows setting some of the highest speeds mainly because it is PWM controlled, and now I’m not afraid to use the word extremely quiet running of the motor and bearings. This is also visible in the spectrograph, where in the frequency band of these components the noise is extremely low. Noctua deserves all the respect in the world here for going into such details as smoother/quieter PWM waveforms with a slanted left-hand side of the pulses. The cable is “ordinary” but solid – flat, with the wires holding together nicely. There are two connectors at the end. One to connect the fan to the motherboard or hub/controllers, and the other to daisy-chain another fan. The cable is 40–45 cm in length.

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