Summary: i bought three or these - two to replace the stock fans that came with my computer - very good tower by the way and from dabs.com! so yea the fans where rather loud and had LEDs that i did not like. these fans are silent and all in black which matches my all black set up.
Summary: This must be one of the quietest fans I've used. States 18dBA on the box (as opposed to 22.05 dBA stated here. Comes with 4 screws and a 3 to 4 pin adaptor (which many don't). Rotates at 1800 RPM. Very good buy for the money. Would definitely recommend.