Noctua NH-U12P 4 Dual Heat-Pipe 120 mm SSO Bearing Quiet CPU Cooler - Retail Noctua NH-U12P 4 Dual Heatpipe 120mm SSO Bearing Quiet CPU Cooler_ Retail Spec.Type : Fan & Heatsinks Fan Size : 120 x 120 x25mm ( Compatible with 120 x 120 x 38mm ), Available for Two Fans installed. RPM +/- 10% : 1300 RPM ( standard ), 1100 RPM ( w/ L.N.A ), 900RPM ( w/ U.L.N.A.) Voltage Range : 12V MTBF &gt; 150,000 h. Material : Copper ( Base and Heat-pipes), Alum.( cooling Fins ), Soldered Joints, Nickel Plated. Dimension : 6.2x4.96x 2.79(HxWxD) ( Without Fan ) 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, 16.9dB(A)(w/ L.N.A ),