They say it's incredibly quiet, completely inaudible at low speed, and has a variety of accessories for low noise applications. In general, higher RPM speeds result in higher noise levels, but note that the relation of RPM speed and noise differs from fan size to fan size (e.
The NF-A15 is a premium quality quiet 140mm fan with a round frame that complies with Noctua’s AAO (Advanced Acoustic Optimisation) standard. Its performance-oriented 1500rpm top speed and comprehensive speed control options make the NF-A14 PWM an elite choice for users who strive to strike a perfect balance between excellent cooling capacity and superb quietness of operation, be it on watercooling radiators, on heatsinks or in case ventilation.It utilises Noctua’s state-of-the-art Smooth Commutation Drive technology and reference class SSO2 bearing, ensuring a remarkable performance. That being said they serve a great purpose - the soft rubber corners buffer any potential vibration of the fan being transmitted to the case - not that these fans have any vibration as the fan is virtually silent and vibration free. While many fans produce unpleasant, high-pitched noises when installed in typical applications such as on heatsinks or radiators, the NF-A12x25 has been carefully fine-tuned for optimal on-application acoustics.
Featuring advanced aerodynamic design measures such as Flow Acceleration Channels and Noctua’s AAO frame, the NF-A4x10 FLX is a highly optimised, premium quality quiet fan in 40x10mm size. The NF-A8 features the further optimised second generation of Noctua's renowned, time-tested SSO bearing. It is not possible for us to draw any conclusions about you, and any data collected as a result will never be passed on to third parties.
One irritation was installing them - the fan has eight soft rubber corners fitted to it - be aware that the buggers can fall off when trying to pull the very clever soft rubber connectors through (no screws) to fit the fan.
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Joined in 2023 
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Joined in 2023 
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63 
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