We've reviewed quite a few fans here at DragonSteelMods lately and today we've got yet another one, but this one is a bit different, it's from Noctua. At first glance the NF-P12 looks like other Noctua fans, but upon closer inspection you'll notice it has what appears to be serrated fan blades. The serrations are called Vortex-Control Notches actually and they help to keep the NF-P12 running quietly and efficiently at all of the available speeds.

http://www.dragonsteelmods.com/index...33&Ite mid=38