The backside of the Compaq Proliant servers show the dual power supplies on the right hand side. Also notice that each Compaq server has 2 Eternet cards. Like the Sun servers, the Compaq servers are conntected to a secondary (backup) network, which is used for backing up client data to a tape library.

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Above are some Cobalt RaQ 2 and 3 dedicated servers. In the backgroud are some 1U and 4U chassis dedicated servers. 1U, or rackmount unit, is 1.75" tall. Standard rackmountable servers are measured in this convention. The Cobalt RaQ servers are 1U chassis, and have become very popular as a dedicated hosting solution.