FrostyTech posted a nPowertek NPH 775-1 Socket 775 Heatsink review

nPowertek NPH 775-1 Socket 775 heatsink looks deceptively simple at first glance; but at the heart of this Intel cooler is a huge copper cylinder. The large copper column is not technically a heatpipe as we know it, it's what TTIC call a "heat column." This column, 25mm in diameter and made from a hollow copper cylinder which is vacuum sealed, has a chemical coating on the inside that works to the same effect as a wick in a traditional heatpipe. The heat column used here is essentially an empty cylinder of copper which has been internally coated with a thin "superconducting heat transfer medium." The copper cylinder is sealed off at both ends, and inside is under a vacuum of approximately 1 Torr. The 18x80x80mm looks a little timid for the open framed nPowertek's NPH 775-1 heatsink, but it seems to get the job done without much fuss.

nPowertek NPH 775-1 Socket 775 Heatsink Review