Fostering Better Heatsinks - Does Zalman really use Composite Heatpipes?
 

Heatpipes are among THE most important components of a modern heatsink, but not all heatpipes are created equal. The problem for consumers is that you can't see what's inside a sealed copper tube embedded in a heatsink. You simply have to trust what the manufacturer says is true, unless you want to destroy a rather expensive heatsink... so Frostytech did just that.

http://www.frostytech.com/articlevie...articleID=2616