Built for overclocked systems and demanding workstations, the Dark Rock 4 Air Cooler from be quiet! features six 6mm copper heat pipes, a 135mm Silent Wings PWN fan with nine airflow-optimized blades and a speed of 1400 rpm, a six-pole motor, and a fluid-dynamic bearing. If you'd like to improve the Dark Rock 4's cooling efficiency, an additional 120mm fan can be added, and clips are included to accommodate this. Living up to its name, this be quiet! product generates only 10.5, 15.6, and 21.4 dBA of noise under 50, 75, and 100% loads, yet offers a cooling capacity of 200W TDP. It has a lifespan of up to 300,000 hours and can be used with select Intel and AMD sockets.