"Looking at the Vendetta from above shows the improvements made from the Xigmatek design on the fins. Dimples were placed in all of the fins to create turbulence which reduces the skinning effect of the air passing over the fins. Also, a “V” bend was added to the fins to increase overall surface area without compromising the compact design. The other notable feature of the cooler is the H.D.T. (Heat pipe direct touch) design, where the heat pipes are in direct contact with the CPU. The bottom of the cooler is flat; once the heat pipes and base are mated, they are machined as a single piece to achieve a truly flat mating surface."
FULL STORY @ OVERCLOCKERSCLUB (http://www.overclockersclub.com/reviews/ocz_vendetta_review/)