ZeroHeat HK555 Intel Sandy Bridge Xeon Core i3 Core i5 Core i7 for socket 1150/1155/1156 2U Active Solution 2 Ball Bearing CPU Cooling fan CPU Support: LGA 1155: Intel 2nd Generation Core i7-2600, i5-2500 series & Sandy Bridge Xeon Processors 1220, 1220L, 1225,1230, 1235, 1240, 1245, 1260L, 1270, 1275 & 1280 CPU Support: LGA1156: Intel Core i3 i3-530 & i3-540, Core i5 i5-650, i5-650, i5-660, i5-661 i5-670 & I5-750; Xeon Processor 3400 Series; Core i7 Processors, I7-870 & I7-860 Overall Dimension:94.0 x 87.5 x 67.7mm Material: Copper Base & Aluminum Fins with Heatpipes with Grease preapplied Fan Spec: DC 12V, 77x77x20mm fan with PWM function control in 4500rpm, 46cfm, 45 dba