The SilenX EFZ-120HA5
Figure 4 illustrates the front of the heatsink. Here you can also see a small auxiliary heatsink over the base of the cooler. Also notice that the heatpipes are not in a straight line, but rather are spread out inside the heatsink.
Figure 5 reveals the side of the heatsink. As is the case with many coolers nowadays, the fins are folded at the side, creating a closed surface.
Figure 6 reveals the top of the cooler. You can see that the fins are not smooth, but have small rugosity in order to improve the heat transfer.