Noctua NH-D9 DX-4677 4U. Type: Air cooler, Fan diameter: 9.2 cm, Rotational speed (min): 400 RPM, Rotational speed (max): 2500 RPM, Bearing type: Self-Stabilising Oil-pressure Bearing (SSO). Voltage: 12 V. Width: 95 mm, Depth: 120 mm, Height: 134 mm. Product colour: Aluminum, Beige, Brown