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Each mounting corner has a gray color anti-vibration pad that minimizes the vibrational noise coming from the surface on which the fans are installed.
These fans feature double ball bearings from Japanese manufacturer NMB. These bearings provide a much longer service life of these fans having a minimum of 500,000 hours. One possible reason to use these bearings is that these fans have high speed. Maintaining these speeds over a much longer time period would need better bearings but it is also surprising that many other manufacturers are providing similar speed range using Fluid Dynamic Bearings. Anyhow, we don’t know if the motor of these fans has a 6-pole, 3-phase design or not. According to ARCTIC using sinus-magnetizing, the new motor only creates about 5 % of the vibration from the commutation of a regular DC motor without a filter.
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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). We are reporting the absolute temperature on the graph. The testing is done on an open-air bench system. Once inside the chassis, the temperatures are expected to rise and would largely depend upon the optimal airflow inside the chassis. Not every run of the stress test may yield the same result. This could well be due to many factors like mounting pressure, thermal paste application, and varying ambient temperature. Not to mention the silicon differences even among the same category of chips. Hence, it is pertinent to mention the testing methodology along with the specifics. We’ve already tested one 120mm fan with a reduced profile (to 15mm) – the Alphacool SL-15 PWM– this one from Arctic (the P12 Slim PWM PST) differs significantly in its design. The rotor has “only” seven blades, which is relatively small for this fan format, but it is not so surprising for Arctic. It uses fewer blades than usual even on larger fans. Anyway, the important thing is that even a smaller number of blades significantly fills the available cross-sectional area. We can already conclude that operating at about 850 rpm is very inconvenient. The fan hums significantly (at 380 Hz), and the airflow is quite low in this setting, disproportionate to the high noise level. Upwards or downwards, however, the high noise level subsides, although resonant frequencies do occur quite often, at different speeds, but you won’t encounter a worse scenario than the one we pointed out above.
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. 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. I wish I had learned that a decade ago. I would still have a 3Dfx voodoo 5 55500 if I'd not been gaming in a storm without an actual surge protector! The P12 PWM PST fan (hereafter referred to as the P12, but we’re still talking about the PWM PST variant) has a 5-blade axial rotor, which is typical of Arctic’s current “P” series models. Because of the small number of blades and the intention to achieve high static pressure, each blade must be large. If the blades were smaller, a lot of air would escape through them, which would reduce the airflow the more resistance the fan would have to overcome. Thus there is a considerable cross-sectional area covered by the blades, so that the airflow does not decrease excessively even if the fan is operating on restrictive obstacles.I bought these 2 Arctic P12 fans to replace the ones that came with my Corsair AIO and they blow them out of the water!
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