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I'm not an expert on them, but as I understand it they are indeed smaller, consume less power, and are well suited for quick and cost effective scaling. According to a Cnet article that I read, over 400 HP ProLiant MM300 microserver cartridges can fit in a standard single 42U rack. Here is the link to that article if you want to read more
Microservers are an emerging form factor of servers designed to process lightweight, scale out workloads for hyper-scale data centers.