Noctua NF-R8 PWM 4 pin Cooling Fan Proven NF-R8 Design. Tens of thousands of quiet cooling enthusiasts swear by Noctuas classic NF-R8. Its impressive quietness, excellent performance and impeccable, time-tested quality made the R8 a default choice for 80mm quiet cooling. Supporting fully automatic PWM speed control, the NF-R8 PWM uses Noctuas novel, custom designed NE-FD1 PWM IC that integrates Smooth Commutation Drive (SCD) technology. The NF-R8 PWM is supplied with a Low-Noise Adaptor (L.N.A.) that reduces the maximum fan speed from 1800 to 1300rpm. The L.N.A can be used either to run the fan at a fixed speed of 1300rpm or to cap the maximum speed when using automatic PWM control. Extensive Cabling Options that are fully sleeved and a 4-pin y-cable allows to connect a second NF-R8 fan to the same PWM fan header for automatic control. Combining the proven concept of hydrodynamic bearing w/ an add'l magnet tht supports the self-stabilisation of the rotor axis, Noctuas time-tested SSO-Bearing tech. has become synonymous w/ supremely quiet operation & exceptional long-term stability. Size: 80x80x25 mm. Connector: 4-pin PWM. Bearing: SSO. Blade Geometry: Raised Blade Design. Rotational Speed (+/- 10%): 1800 RPM. Rotational Speed with L.N.A. (+/- 10%): 1300 RPM. Min. Rotational Speed (PWM): 300 RPM. Airflow: 53,3 m/h. Airflow with L.N.A.: 39,4 m/h. Acoustical Noise: 17,1 dB(A). Acoustical Noise with L.N.A.: 10,2 dB(A). Static Pressure: 1,41 mm H2O. Static Pressure with L.N.A.: 0,74 mm H2O. Max. Input Power: 0,72 W. Max. Input Current: 0,06 A. Voltage: 12 V. MTBF: &gt; 150.000 h. Scope of Delivery Low-Noise Adapter (L.N.A.): 4-Pin Y-Cable,30cm Extension Cable,4 Vibration-Compensators,4 Fan Screws