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Thanks to psychoacoustic optimizations like the Vortex-Control Notches, the new SCD drive system and Noctua's premium-grade SSO-Bearing, the NF-B9 achieves exceptional quietness and long-term stability.

Due to the advanced design measures like the bevelled blade tips, the NF-B9 is surprisingly quiet despite its outstanding airflow and pressure performance.  The psychoacoustic optimisations like the Vortex-Control Noctches make the NF-B9's noise pattern more pleasant to the human ear.  The new SC drive system reduces torque variations and thereby ensures improved running smoothness particularly at lower speeds.  Noctua's well proven SSO-Bearing technology gaurantees supremely quiet operation and exceptional long-term stability.