After experimenting with different options for fan blade design, Zalman has taken cue from the scientifically proven “shark fin” blade design that many manufacturers have adopted. This design is proven to reduce turbulance coming of the back side of the blades. With reduced turbulance, the blades are more stable, wear less on the bearings, and noise is significantly reduced.
Zalman is so happy with the new design that they have adopted the new blade design for their entire line of fans. This includes both the ZM-Plus (SF) Series and the ZM-FDB(SF) Series which are plain black performance oriented and black with clear LED lit blades respectively.
The new lines should be available Q1 of 2014 for around $20 USD.