That doesn't seem very silent at all. I know I keep harping on about them, but the Prolimatech Ultra Sleek Vortex 14 is 140mm, but only 15mm thick, but have similar airflow at around 600rpm, and are under 18dBA. They're not perfect, for example they lack built in rubber grommets, but using either rubber washers or anti-vibration "screws" leaves them practically silent. They are a bit pricier, but with their size and 120mm mounts they're great as both CPU coolers and case fans.I suppose for the price these NZXT offerings aren't too bad, but they just don't seem very impressive either.