Review on Noctua NF-S12A ULN: The Ultimate Ultra Quiet 120mm Silent Fan (Brown, 3-Pin) by Wiktor Franko ᠌

If you connect directly 12V, then the blades create some noise and drive the wind - be healthy. If through the Low-Noise adapter, then the blades are almost inaudible and the wind is quite decent. If through the Ultra Low-Noise adapter, then the blades are not audible at all, but the breeze is so-so. The bearing is not audible in any mode. There is no vibration as such. ate after a year and a half of round-the-clock work: All 4 fans work flawlessly. The hydrodynamic bearing is a really cool thing.