FrostyTech has posted an AVC 112C81 Copper-Core Heatsink review

With the core of the silicon chip in direct contact with the 30mm diameter copper core insert, heat energy can be transferred from the microprocessor and spread out to a larger surface area before being picked up by the aluminum extrusion. In that sense, the copper core enlarges the working section of the extrusion, and that can help make the heatsink more efficient. This cooling technology is also useful as the core size of today's chips continues to shrink. A heatsink cannot cool a small 180mm (squared) patch as efficiently as it can a much larger sized heat source. With sizes that small, issues of lateral heat flow within the base of the heatsink come into play, and that can hamper things.

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