Enermax ETS-N30-HE With 9CM Fan Features: Patented SEF (Stack Effect) design to enhance heat transfer. Unique air path creating high VEF (Vacuum Effect) to optimize the airflow. HDT (Heat-pipe direct touch) technology to ensure rapid thermal conduction and eliminate CPU hot spots. Compact heatsink size for the utmost compatibility. 1-clip fan bracket design for user-friendly installation. Patented circular type LED with 9 diodes and up to three times brighter than other LED fans. (ETS-N30-TAA only) High thermal conductivity grease to ensure the best thermal conduction between CPU and the heatsink. Twister Bearing technology for longer lifetime and low noise. (ETS-N30-TAA only) Anti-vibration rubbers prevent fan vibration and absorb noise. Durable metal bracket for Intel 775/1150/1155/1156/1366 amp; AMD AM2/AM2+/AM3/AM3+/FM1/FM2/FM2+. Specifications: Material : Copper Heat Pipes/Aluminum Fins Thermal Grease : Dow Corning TC-5121 Fan Dimension : 92 x 92 x 25 mm Fan Speed : 800 ~2800 r.p.m. Air Flow : 15.9~55.4 CFM10%