be quiet! Dark Rock 6 CPU Air Cooler 135mm Silent Wings PWM Fan 6 Heat Pipes Semi-Passive Quiet Mode & Performance Switch 31.1dB(A) High.

Semi-passive quiet mode with full fan stop for completely silent operation Hardware switch to toggle between performance and quiet modes 6 optimized high-performance heat pipes Optimized heat sink for more cooling power Silent Wings 135mm PWM fan for perfect air pressure and virtually inaudible operation Only 31.1d B(A) at maximum fan speed High RAM and VRM cooler compatibility thanks to an asymmetrical design and cut-outs on the heat sink Ceramic-particle black coating and magnetic top cover create the elegant signature be quiet! look Compatible with liquid metal thermal grease 3-year manufacturer's warranty