Although very low, we did observe some vibration even with the Noctua NF-A14x25 G2 PWM fans. However, one question still remains unanswered, namely, how much range can there be in the observed vibrations across samples. We will focus on this in the coming weeks, and you can make your own guesses about the range of vibrations. The most accurate of you will then win… yes, the Noctua NF-A14x25 G2 PWM.
We’ve done this before with the inexpensive Endorfy Stratus 120 PWM fans and now we’re doing a rerun with more expensive fans. Because of the higher manufacturing costs, with the associated lower manufacturing tolerances, Noctua NF-A14x25 G2 PWM fans should fare significantly better (than the low-cost Stratuses from Endorphy). This is also the main hypothesis we will work with – the vibration range of the Noctua NF-A14x25 G2 PWM fans will be significantly smaller than that of the Endorfy Stratus 120 PWM fans.
Again, as last time, we are interested in the largest range we can measure at comparable speeds. The individual modes will be set in increments of 200 rpm. We will start at 300 rpm and gradually (through 500, 700, 900, 1100 and 1300 rpm) we will go up to the maximum specified speed of the Noctua NF-A14x25 G2 PWM – 1500 rpm.
15 fan samples will be tested for vibration, it is always sensed in three axes by our standard methodology, but we calculate a 3D vector from these, which is a single value, for the sake of convenience. This in units of mm/s. And now to what we are interested in. In which of the speed modes will the greatest range be achieved? How great will it be? You can put it in the form of x mm/s to y mm/s, or a multiple of the difference between the minimum and maximum values if you don’t have a good idea of the specific numbers. If anything is unclear, there are comments below the article where you can ask your question.
Send us your guesses to info@hwcooling.net with the subject „Noctua NF-A14x25 G2 PWM vibration range“. The deadline is December 6, 2024 (23:59 CET). The correct answer and the name of the winner who will be the closest to reality with their guess will be revealed in the Noctua NF-A14x25 G2 PWM vibration test published later in December. For the winner, we have prepared 10× (“ten pieces” of) Noctua NF-A14x25 G2 PWM, which is enough to provide complete system cooling with these fans even in a full tower. And that’s with a view to extremely quiet operation at the same time as high air flow.
You can compete from anywhere in the world, we’ll send your prize anywhere. So there are no geo-restrictions.
Don’t miss: Noctua NF-A14x25 G2 PWM: Finally a first-class 140mm fan
English translation and edit by Jozef Dudáš
Could you run automated extremely slow pm sweep and measure vibrations continuously, then plot it? Show graph having avg line and envelope of min&max in function of rpm.
Thank you for the useful tip for a test. We probably won’t be able to make it in time as part of these basics tests that are coming out in December. There is a clear template for them and there won’t be too much time to experiment. Anyway, after the tests, we will set aside the most and least vibrating sample and may (I make no promises) come back to this as part of additional measurements.
Please note: Based on the discussion under the SK article, and after some consultation, we have slightly modified the wording of what we want you to do: you can put it in the form of x mm/s to y mm/s, or a multiple of the difference of the minimum and maximum value if you don’t have a good idea of the specific numbers.