nPowertek TTIC NPH K8-1 Heatsink
 

The Thermal Transtech International Corp. NPH K8-1 Socket 939 heatsink looks deceptively simple at first glance; but at the heart of this socket 754/939/940 Athlon64 heatsink is a huge copper cylinder. The large copper column supporting its many copper fins 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.