The boys at Overclocked Cafe check out the Vantec Aeroflow CPU cooler... It
looks pretty cool, check out what they say about it here.
In a conventional spindle motor fan, a "dead" area is created
right behind the bulky motor, this prevents air from passing efficiently directly
below the fan (which is where the core of the CPU is located at if you think
about it) not giving the hottest part of the heatsink the same airflow as the
cooler parts get. There still is a small dead area, but it's cross section is
so small that it is a significant improvement over conventional fans. What this
translates into is lower RPMs (and lower noise) while providing equal if not
better airflow to the heatsink.