Have the NF-A15 fan on my Noctua NH-U14s cooler than second fan (pull) mounted (important: Increased distance from the radiator fins using the included spacers). The quality of the fan is superior in features (rich fastening and cable material) and smoothness. Bring 2-3 deg C additional reduction in the Max-temperature, whether it's worth, everyone must decide for themselves. Since I often operate the computer under high load, one of each grade for me. It is advisable in any case to set up a fan profile so that the Ventilaor does not go into the highest number of revolutions. It can namely be slight Schnarr noises the fan blades. This of course presupposes appropriate control by the mainboard and its firmware. With ASUS 'Thermal Radar "example that's without any problems. Caution: If you want to use this as a fan case fan, sufficient space must be available, because the external dimensions that go beyond that of a 140mm fan. Oh, the color is really something repulsive (like a piece of butcher-hung ...) - but increases the recognition value.
