Noctua NF-P14s redux-1500 PWM, 4-Pin, High Performance Cooling Fan with 1500RPM (140mm, Grey) Renowned NF-P14s high-end 140x25mm 12V fan, more than 100 awards and recommendations from international computer hardware websites and magazines, hundreds of thousands of satisfied users Highly optimised low-noise design provides outstanding quietness of operation, excellent static pressure and strong airflow (CFM), square frame for water cooling radiators and chassis ventilation 1500rpm 4-pin PWM version with excellent balance of performance and quietness, supports automatic motherboard speed control (powerful airflow when required, virtually silent at idle) 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