Noctua NH-L12 Low-profile Quiet CPU Cooler with 120/90mm Dual PWM Fan The NH-L12 can be used with the NF-B9 92mm fan only in order to reduce the overall height to 66mm. This way, the cooler is suitable for many typical ATX or Mini-ITX enclosures and ideal for whisper-quiet HTPC systems. PWM support and Low-Noise Adaptors. The NH-L12's NF-F12 and NF-B9 fans support PWM for convenient automatic speed control. In addition, the maximum fan speed can be reduced to 1200/1300rpm using the supplied Low-Noise Adaptors for even quieter operation. Noctua's enthusiast grade SecuFirm2 multi-socket mounting provides broad socket compatibility (LGA 2011, LGA1366, LGA1156, LGA1155, LGA775, AM2, AM2+, AM3, AM3+, FM1) and meets the highest demands in safety, performance and ease-of-use. Some Intel based Mini-ITX main boards don't allow for the installation of backplates. The NH-L12 thus comes with an extra set of Intel mounting bolts which make it possible to install the cooler without using the SecuFirm2 backplate. Fan Size: Noctua NF-F12 PWM & NF-B9 PWM. Compatibility: Intel LGA 2011, LGA 1366, LGA 1156, LGA775, AMD, AMD2 AM2+, AM3, AM 3+, FM 1 (Backplate required). Bearing: SSO-Bearing (Self-stabilizing oil-pressure bearing). RPM +/- 10%: 1500/1600 RPM (Max), 1200/1300 RPM(w/L.N.A). Min Rotation Speed (PWM): 300/300RPM. Air Flow: 93.4/64.3m/h (Max), 74.3/52.6 m/h (w/L.N.A.), 63.4m/h (W/U.L.N.A). Acoustical Noise: 22.4/17.6 dB(A) (Max), 18.6/13.1dB(A)(w/L.N.A ). Input Power: 0.6/0.96W.Voltage Range : 12V.MTBF &gt; 150,000h. Material: Copper (Base and Heat-pipes), Alum.(cooling Fins), Soldered Joints, Nickel Plated. Dimension : 5.04-Inchx5.9-Inchx 2.6-Inch (Without Fan), 5.04-Inchx5.9-Inchx 3.66-Inch (With Fan). Weight: 1.0 Lbs (Without Fan), 1.5 Lbs (With Fan)