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It should go without saying, you need a motherboard to fit the processors into. There are a lot of boards out there to choose from that will take dual Xeon processors. For this build I'm going for the ASUS Z9NA-D6 serverboard.
Not only does this part offer all the ports and connectors that you want from a motherboard, it has been designed so that it will fit into standard ATX cases and take ATX power supplies. This allows you to make use of more readily available, and cheaper, components.