Thermaltake Silent 939 K8 CL-P0200 Cooler with Heatpipe Cooling Tech for the AMD Opteron, Athlon 64, Athlon 64 FX, Sempron Designed for AMD Opteron, Athlon 64, Athlon 64 FX, Sempron Socket Heatpipe technology transfers heat efficiently Copper base soldering and aluminum fins provide perfect contact to ensure the maximum performance Silent fan at only 19dBA, circular frame design with 11 fan blades centralize and increase air flow Engineered tool-free metal clip design allows for easy installation