The Igloo 5761 Silent heatsink uses a familiar top-down-fan approach, with three 6mm diameter exposed base heatpipes conducting heat from the CPU to a small thin aluminum fin cooling stack. The cooling fins are topped off by a bright yellow 92x92x25mm PWM vaneaxial fan that operates at a fixed speed of 1200RPM. The fan outputs roughly 34CFM of air according the mfgr's specs, the airflow being directed down through the aluminum fin array and past the three intersecting copper heatpipes.

Glacialtech's Igloo 5761 Silent heatsink weighs a feathery 350 grams and comes with a pre-applied patch of thermal interface material so installation is a snap. It retails for about $20 USD. The heatsink is compatible with Intel socket LGA1155/1156/775 and lower TDP AMD socket 754/939/940/AM2/AM3/FM1/FM2 processors.

Glacialtech Igloo 5761 PWM Heatsink

heatsink specsheet manufacturer: glacialtech model no.: igloo 5761 silent materials: aluminum fins, nickel plated copper heatpipes and copper base fan mfg: glacialtech jt9225l12s012a fan spec: 1200rpm, 12v, 0.12a fan dim: 25x92x92mm heatsink & fan dim: 89x96x114mm weight: 350 grams includes: multi-socket mounting hardware, instructions Compatible with Sockets: AMD: AM2/AM3/FM1/FM2 Intel: LGA775/1156/1155 Est. Pricing: $20USD ($20CDN)

The exposed heatpipe base of the Igloo 5761 Silent consists of three 6mm diameter heatpipes set into a 19mm tall, extruded aluminum heatsink. The solid portion of this combination base/heatspreader ranges from 4mm to 8mm thick.

The top of the aluminum fin stack is wavy to help break up airflow and reduce resistance from the fin stack to the air flow exiting the smallish 92mm fan. The cooling fin array measures 96x91x29mm in size. The aluminum fins are press-fit over the nickel plated copper heatpipes, but not soldered to them.