Bigger fans are the future, mark my words. I've been saying it since the fans were little. Noctua isn't denying it.

Noctua needs to take care when printing serial numbers. Mounted in the D15S, you can orient it in any four directions, but two of them are wider than the others when mounted, making it bulge a bit. The two shorter orientations: one has airflow indicator on it and the other has a printed serial. For aesthetic reasons, it'd be better to not have the serial there, but a little rubbing alcohol got rid of it after 10min or so. Otherwise it performs great, dead silent in the 650-850 range, even up to 1000rpm it's fairly inaudible.

Replaced brown Noctua fan for "all black" look - runs dead quiet.

Quiet and doing a great job cooling the cpu.

Engineered by the best. Best of all, they are not brown! Picked up two for a push-pull configuration on the CPU and added a y-cable for connecting them to the MOBO. Note: Chromax does NOT come with their own y-cable. Though Noctua states that this part does come with one, they must be referring to the ugly duckling counterpart.

So quiet, and so… not brown. 5 stars. Would blow again.

upgraded to these on my noctua cooler. great fan as expected from noctua

I love Noctua products, and the chromax series, is the icing on the cake to make your build look amazing! These made my B&W build look like a million bucks! Paired perfect with my NH-D15.

Noctua NF-A15 PWM 140mm Chromax Works great on the Noctua NH-U14S. Dropped 2 of them on there and they idle at around 600rpm and are Dead Silent..

An excellent fan, just like all of Noctua's products. Save 100% fan RPM for emergencies, as around that point it becomes high pitched, but before 80% it's imperceptible.