Noctua NF-A12x25 G2 PWM SX2-PP - 120 mm kabinetventilator, beige (2-pak)

120mm Noctua NF-A12x25 G2 PWM Sx2-PP Gehäuselüfter Noctua NF-A12X25 G2 PWM SX2-PP computer cooling system Noctua NF-A12X25 G2 PWM SX2-PP, Fan, 12 cm, 1800 RPM, 107.3 m³/h, Beige Noctua NF-A12X25 G2 PWM SX2-PP. Type: Fan, Fan diameter: 12 cm, Rotational speed (min): 1800 RPM, Airflow: 107.3 m³/h, Bearing type: Self-Stabilising Oil-pressure Bearing (SSO). Voltage: 12 V. Width: 120 mm, Depth: 25 mm, Height: 120 mm. Product colour: Beige The NF-A12x25 G2 PWM Sx2-PP is a set of two NF-A12x25 G2 PWM 120mm fans that are offset in speed, which can be beneficial in push-pull operation as well as in situations where two or more fans are operating side by side, such as in case cooling applications or on 240 and 360mm water cooling radiators. When two fans are running at almost the same, constant speed in a push-pull configuration or, albeit to a lesser extent, side by side, their acoustic interaction can lead to undesirable harmonic phenomena such as intermittent vibrations or periodic humming due to interference, which can be heard as beat frequencies. Therefore, the two NF-A12x25 G2 PWM fans contained in the Sx2-PP set are slightly offset in speed (+/- ~50rpm) in order to avoid such phenomena. This fine-tuning is made possible by the fans’ novel etaPERF™ motor and its NE-FD6 driver IC that achieves extremely precise speed control and, thanks to its SupraTorque™ feature, can leverage extra torque headroom to keep the exact desired speed even when working against significant flow resistance such as on water cooling radiators and heatsinks. With one fan running ~50rpm slower (PPA) and one ~50rpm faster (PPB), the overall cooling performance can be kept the same while efficiently preventing intermittent vibrations or periodic humming. Since the perception of beat frequencies can vary depending on psychoacoustic preferences, users can easily further optimise acoustics by slowing the PPA fan down a little more through PWM control or the supplied Low-Noise-Adaptor, whic...