Hardware, Reviews

Noctua NH-U9S And NH-D9L Review: The Best CPU Coolers For Small Enclosures


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

The NF-A9 is a successor to the NH-B9 fan, and has a higher 2,000 RPM when seen against the 1,600 RPM of the NH-B9. It is also slightly louder at 22 dBA to the 17.8 dBA generated by the NF-B9. The fan features the latest iteration of Noctua’s self-stabilizing oil-pressure (SSO 2) bearing, which is claimed to be more durable and quieter than fans based on traditional ball bearing designs.