The Xigmatek Dark Knight
Figure 4 reveals the front of the heatsink, which has a very conservative design.
Figure 5 presents the side of the cooler. Only small parts of the side are closed.
Figure 6 shows the back of the cooler.
The top of the cooler is shown in Figure 7, where you can see the shape of the fins. Notice that the dents where you attach the fan exist only at the front, which means that the Dark Knight doesn’t support two fans.