have tried to assemble three of these fans in my computer.
they may have been quieter than the Corsair fans I had. but I was not satisfied!
Corsair fans wines, but Noctua fans had a nagging sound at low speeds. which in itself was lower, but varied and became very annoying.
However, I have also mounted the Noctua NF-A12 PWM fans (to my Corsair Hydro H100i) I am very pleased that I recommend instead!