The Zalman FX100
Figure 4 illustrates the side of the Zalman FX100. Here you can see the curves of the heatpipes.
Figure 5 reveals the rear of the cooler. Notice that there are actually four heatpipes going through the base.
Figure 6 shows a top view of the cooler, which is closed by a removable meshed plate.
Figure 7 unveils the bottom of the cooler. Two heatpipes go for the corners of the heatsink and two enter in the middle, where there are two independent heatsinks.