Succeeding the vastly successful NF-S12, the NF-S12B is a next generation quiet fan featuring Noctua's advanced SCD2 technology as well as a highly optimized blade geometry with Beveled Blade Tips that improves its award-winning predecessor's airflow efficiency by up to 10%. Topped off with Noctua's time-tested SSO-Bearing and versatile 1200/900/600 rpm speed settings, the NF-S12B FLX is a premium quality fan that offers full flexibility in quiet to ultra-quiet case cooling. Bearing Type: SSO RPM: Rotational Speed (+/- 10%) 1200 RPM Rotational Speed with L.N.A. (+/- 10%) 900 RPM Rotational Speed with U.L.N.A. (+/- 10%) 600 RPM Noise Level: Acoustical Noise 18,1 dBA Acoustical Noise with L.N.A. 10,6 dBA Acoustical Noise with U.L.N.A. 6,2* dBA (*extrapolated values) Power Connector: 3 / 4 Pin Color: Brown Compatibility: Case Dimensions: 120 x 120 x 25 mm Features: Highly optimised impeller with Bevelled Blade Tips 3 speed settings for full flexibility Smooth Commutation Drive 2