Noctua NF-P12 120 mm Nine Blade SSO Bearing Fan with VCN - Retail Spec:Type : Fan Fan Size : 120 x 120 x25mm Compatibility : CPU Cooler, Water-Cooling Radiator and Case Bearing Type Features :Pressure-optimized Nine-Blade Design Vortex-Control Notches Smooth Commutation Drive SSO Bearing Air Flow : 92.3m/h (standard), 78.5m/h ( w/L.N.A. ), 63.4m/h ( W/ U.L.N.A ) Acoustical Noise : 19.8 dB(A)/standard : Nine Blade Design with VCN RPM +/- 10% : 1300 RPM ( standard ), 1100 RPM ( w/ L.N.A ), 900RPM ( w/ U.L.N.A.)