The Xigmatek Gaia
Figure 4 shows the heatsink from the front. It is simple, with U-shaped heatpipes disposed in one row at each side.
In Figure 5, you see the side of the cooler, where the thick (8 mm) heatpipes are visible. The sides are partially closed by folded fins.
Figure 6 presents the top of the heatsink. Notice the shape of the fins, which have reentrancies for the fan holders in both sides.