Continuing the renowned legacy of Noctua’s award-winning NH-U9 series, the NH-U9S is a premium quality quiet CPU cooler in classic 9cm size. Its asymmetrical design with 5 heatpipes not only provides even better cooling performance than the previous generation but also improves compatibility: Thanks to its 95x95mm footprint, the NH-U9S clears the RAM and PCIe slots on all Intel and most AMD based mainboards, including µATX and ITX. Combined with its 125mm height, this makes the NH-U9S a highly versatile solution with excellent case, RAM and PCIe compatibility. The included NF-A9 premium fan supports automatic speed control via PWM for outstanding quietness of operation and a second, optional NF-A9 fan can be added for further improved performance in dual fan mode. Topped off with the trusted, pro-grade SecuFirm2™ multi-socket mounting system, Noctua’s proven NT-H1 thermal compound and full 6 years manufacturer’s warranty, the NH-U9S is a deluxe choice through and through. Fan specifications: Model: Noctua NF-A9 PWM Bearing: SSO2 Max. Rotational Speed (+/- 10%): 2000 RPM Max. Rotational Speed with L.N.A. (+/- 10%): 1550 RPM Min. Rotational Speed (PWM, +/-20%): 400 RPM Max. Airflow: 78,9 m³/h Max. Airflow with L.N.A.: 62,6 m³/h Max. Acoustical Noise: 22,8 dB(A) Max. Acoustical Noise with L.N.A.: 16,3 dB(A) Input Power: 1,2 W Voltage Range: 12 V MTBF > 150.000 h