Noctua NF-P12 PWM, 4-Pin Premium Cooling Fan (120mm, Brown) Classic 120mm NF-P12 design, with impressive quietness, excellent performance and impeccable, time-tested quality. Pressure-optimised Nine-Blade Design for high-impedance applications such as CPU coolers, water-cooling radiators or cases with tight fan grills. 4-pin PWM version for automatic speed control via 4-pin PWM fan headers, 1300rpm maximum speed Noctua's SSO-Bearing technology has become synonymous with supremely quiet operation and exceptional long-term stability. Trusted Noctua quality backed up with 6-year manufacturers warranty