be quiet! Dark Rock PRO 2 The virtually silent Dark Rock Pro 2 CPU cooler puts famous anti-noise technology where it counts -at the heart of your system. Its double tower, double fan design is perfect for over clocked systems & the most demanding multi-graphics platforms. Twin quiet-optimized Silent Wings 2 fans with PWM function & seven ultra-high performance heatpipes generate massive TDP cooling capacity & strikes the perfect balance between intense cooling & deep serenity. Special wave-contoured heatsink fins further minimize noise-inducing turbulence while maximizing heat transfer.