Noctua NF-R8 redux-1800 PWM, 4-Pin, High Performance Cooling Fan with 1800RPM (80mm, Grey) Renowned NF-R8 high-end 80x25mm 12V fan, more than 100 awards and recommendations from international computer hardware websites and magazines, hundreds of thousands of satisfied users 1800rpm 4-pin PWM version with excellent balance of performance and quietness, supports automatic motherboard speed control (powerful airflow when required, virtually silent at idle) Highly optimised low-noise design with outstanding quietness of operation, static pressure and airflow (CFM), ideal for chassis ventilation, cooling fan replacement for NAS and other devices, etc. Streamlined redux edition: proven Noctua quality at an attractive price point, wide range of optional accessories (anti-vibration mounts, S-ATA adaptors, y-splitters, extension cables, etc.) Trusted premium brand, time-tested SSO bearing system with more than 150,000 hours service life (MTTF) and 6-year manufacturer-warranty