Heatsink Top:
There are no cross cuts in the body of the Silencer 64 Ultra TC heatsink, and the fins have a smooth finish. Note the thermistor wedged in between the aluminum fins at the lower left side. The heatsink retention clips are screwed directly into the body of the cooler, which is a good change from how these mechanisms are usually configured. The fan attaches directly to the extrusion with a couple of spring clips, so there are no screws required.

Heatsink Side A:
The two wires leading into the space between the bent aluminum fins are where the thermistor is located. The thermistor controls the fan speed (1000-2500RPM), and consequently the amount of noise generated by the Silencer 64 Ultra TC heatsink. The unique fan design suspends the impeller blades a few millimeters above the tips of the heatsink. The fins are 1mm thick, and spaced 1.8mm apart. The height of the heatsink fins averages 27mm, with the base thickness between 8-11mm.

Heatsink Side B:
There are two separate clips on the Silencer 64 Ultra TC heatsink. Both latch onto all three prongs of the K8 retention frame, but are not mechanically joined together. This allows the central space of the heatsinks to remain usable for the business of cooling, and is a simple but very nice design choice. The outside surfaces of the aluminum extrusion are scalloped, the inner fins are not.