be quiet! Dark Rock Pro 6. Type: Air cooler, Fan diameter: 120/135 mm, Rotational speed (max): 2000 RPM, Airflow: 135.04 m³/h, Maximum air pressure: 2.25 mmH2O, Bearing type: Fluid Dynamic Bearing (FDB). Width: 140 mm, Depth: 147 mm, Height: 169 mm. Product colour: Black