Thermaltake Silent Boost RX K8 CPU Cooler
 

What makes the Silent Boost unique is the fan. This meaty 5 blade fan is what
Thermaltake calls a "reversed fan". There is no housing that surrounds the fan
blade tips. Thermaltake figures this is the main cause for turbulence, causing
noise when the fan is in operation. The fan uses a standard 3-pin connector
whose wires are sleeved. A 3-pin to Molex connector was not included.