We're testing four nettops: Arctic Cooling’s MC001-BD, ASRock’s CoreHT 252B, Giada’s i50, and Zotac’s Zbox AD03BR-PLUS. All of these tiny, quiet systems take a very different approach to compact computing, and we fill you in on what makes them unique.

Intel’s Atom CPU might have been the driving force behind the popularization of the nettop form factor, but manufacturers are squeezing more powerful hardware into these tiny machines. Sometimes, more potent graphics performance is added via a mobile chipset. Sometimes, processing m muscle is emphasized instead with a CPU designed for powerful notebook. And now, APUs belonging to AMD's Fusion initiative are an option, serving up efficient power use and higher-performance graphics on a single processor die.