Thermaltake Sonic Tower CL-P0071 4-in-1 Heatpipe Cooling Solution for P4 478, 775, K7, and K8 High performance fanless CPU cooler, 0dB cooling solution, reduce total system noise 6 heatpipes and all copper structure provides best performance Heatpipe technology transfers the heat quickly More surface area gives good heat dissipation Aluminum fin soldered to copper base, perfect contact to ensure the best performance