To run a dual setup you need two 200 series Opteron processors.
Tyan motherboards are always my recommendation.
Kingston HyperX registered is also great memory for Opterons.
The Boxed should mean the CPU is a processor-in-a-box, or retail package.
The advantage is that you get an approved heatsink, thermal interface, and three year warrenty. (none of which you will get when buying a OEM cpu)
FYI: The three year warrently is only on Opterons, Athlon64's and FX's have a one year.
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