The Cooler Master Hyper 612 PWM
Figure 3 shows the cooler from the front. Here you can see the semitransparent front fan.
In Figure 5, you see the side of the heatsink, which is very large. Notice that only a very small part of the heatsink side is closed.
Figure 6 reveals the rear of the heatsink. Here, you can install a second fan, using the included frames.
On the top of the cooler, there is a black aluminum part with the Cooler Master logo that allows you to see the tips of the well-spaced heatpipes.