Frostytech has posted a review on the Thermaltake Silent Boost K8 Athlon64 Heatsink
The Thermaltake Silent Boost K8 heatsink is a mainstream cooler for AMD Athlon64 and Sempron socket 754/939/940 processors. The heatsink is completely made of copper components for the metals' high thermal conductivity properties, and utilizes a Panaflo FBL08A12M fan for its lower noise generation. As with most of Thermaltake's offerings, the model A1838 "Silent Boost K8" is quite affordably priced, although it is absolutely not a "silent" heatsink.Thermaltake Silent Boost K8 Athlon64 Heatsink Review