Tom's Hardware thinks the cooling system used in the ZBOX CI620 is weird ("étrange"). They wish the heat pipe would connect directly to the aluminum fins on the sides. We agree.

As it is, the small copper heat pipe is tucked under a metal plate. It looks like heat reaches the side fins only via the small top fins! This heat flow path is unnecessarily convoluted and inefficient.

Too bad since, according to the reviewer, the CI620 looks great and is a pretty capable silent PC (no coil whine detected).

Source: Tom's Hardware (French)