I’ve used Mac Pros and Mac minis as servers. While management is usually easier than with a Windows or typical Linux setup on PC hardware, stability and speed were inherent issues with both. John Rizzo describes a powerful server solution using the new Mac Pro.
A Mac mini hosting company, MacStadium, has come up with a solution. Their rack holds 270 Mac Pros in 12 square feet of floor space — more server power than could typically be housed in the same space with conventional server hardware.
More computing power, less heat, lower power requirements, comparable price tag. However, the Mac Pro comes with two powerful graphic cards which are unnecessary in a server environment. Apple will show the Mac Pro to be serious for servers when it ships a version without the graphic horsepower.
OS X Server is an anemic solution but coupled to a Mac mini is good for small networks.