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On the other hand, if I recall right the internet is rife with customer reports of the Arctic fans having noose spikes / unpleasant hums or resonances at certain RPMs. Lots of people using config tuning to avoid it.

I ended up buying Pure Wings as mentioned. Also much cheaper than Noctua and seemingly not having those issues.

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It's funny because I replaced my NF-A14 and NF-F12 because they had hums at certain rpms when used on radiators, and neither the Arctics before them, nor the BeQuiets that replaced them, had that issue.
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Noctua is working at the last five percentages of performance AND lifespan. They want their fans to perform (and sound) identical ten years later with daily use. Most people change fans far earlier than that.

It’s kind of refreshing to see really.

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Indeed, the main reason why I choose Noctua fans from those that are silent enough and efficient enough is because I trust their reliability.

I still have computers from 2017, with Kaby Lake CPUs, which have been used as servers and in which the Noctua fans work as well as in the first day. Prior to that I had some computers with Noctua fans that had been used for more than a decade without fan problems, and which were upgraded or replaced for reasons unrelated to fans.

Thus the good experience that I had with the reliability of Noctua fans, coupled with some bad experiences with cheaper fans, which had to be replaced prematurely, make me reluctant to experiment now with other brands, which might have the same performance when new, but I could learn about their reliability only after a few years.

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