The Fans:

There are 52 fins in total on the CNPS6500B-Cu model, and each fin is about 53x68x0.5mm in size. Altogether the heatsink weighs in at 898 grams, making it one of the heaviest heatsinks out there. At the circumference of the fins, the tips are spaced roughly 2mm apart for good airflow. The use of full copper fins means heat is spread up from the core quickly and out to the outer edges of the fan heatsink.

Side B:
To improve circulation, and increase surface area, Zalman have perforated the fins with five 3mm x 41mm slots. A few creeses have been added to the copper fins to help make them a bit more rigid, and the tops have also been scalloped. The two bolts which hold the many pieces together are stainless steel, and the side aluminum flanges are used during mounting in the heatsink retention mechanism.

Zalman have always finished their heatsink bases to impeccable standards as far as we're concerned. With the larger 6500 series it is really important not to bang the heatsink down on a hard surface upside down. Since the base is machined so well, only a very small amount of good quality thermal compound should be applied. The entire base area measures 56x83mm.