Design wise, the Andy Samurai Master heatsink weighs in at 685grams and comes packing no less than six 6mm diameter copper heatpipes and a 120mm 1200RPM fan.
On top of that, Scythe employ a rather novel fin technique it terms the "Infinity Interleave Fin Structure". What that basically describes is a heatsink built with two different sizes of aluminum fins. There are small fins which extend just 26mm and full-size fins that extend the full 125mm width of the body. The IIFS technique keeps fin density around the six heatpipes high, while allowing a wider fin pitch in the areas which receive less airflow.
FULL STORY @ FROSTYTECH (http://www.frostytech.com/articleview.cfm?articleID=2222)