Radeon HD 5830/5850/5870 cards have the same coolers. Each features a heatsink, a massive copper baseplate and a cover with a fan.

The baseplate connects to the heatsink via heatpipes and cools down both the core and memory. In turn, the cover directs air away from the large, slow fan.

The cooler is quiet, but hot air is directed both outside and inside PC enclosure. Besides, the exhaust hole isn't very big due to the two DVI connectors.

This is the good old Arctic Cooling IceQ cooler with a fan on the end. It covers both the core and memory chips, but, strangely enough, only cools down those on the front side of the PCB. Like all IceQ solutions, this one is silent.

This cooler consists solely of a heatsink and doesn't make any noise. However, it clearly cannot handle core temperature that exceeds 90°C. This is bad, considering the low-end nature of the graphics card which is intended for compact, low-power machines. Since there's no fan that could drive hot air away, the card will heat up all other PC parts to very high temperatures.

Perhaps HIS should've come up with a thicker heatsink, covering more PCB. This is a dual-slot solution, after all.