Noctua CPU Cooler NH-U12P SE2 Blade Geometry : Nine Blade Design with VCN; RPM +/- 10% : 1300 RPM ( standard ), 1100 RPM ( w/ L.N.A ), 900RPM ( w/ U.L.N.A.) Fan Size : 120 x 120 x25mm ( Compatible with 120 x 120 x 38mm ), Available for Two Fans installed.Bearing Type : SSO-Bearing RPM +/- 10% : 1300 RPM, 1100 RPM ( w/ L.N.A ), 900RPM ( w/ U.L.N.A.).Air Flow : 92.3m/h, 78.5m/h ( w/L.N.A. ), 63.4m/h ( W/ U.L.N.A ) Material : Copper ( Base and Heat-pipes), Alum.( cooling Fins ), Soldered Joints, Nickel Plated; Weight : 1.7 Lbs ( With Fan ) Features :Award-winning NH-U12P Heatsink, Raised Fin-stack of U-type Design for Perfect airflow direction and excellent compatibility.