Pull the cover on the Dev box and look at where the RDIMMs are located and see if they are all populated on one socket or balanced across both of them.

To get started on learning about NUMA:

http://www.sqlskills.com/blogs/jonathan/understanding-non-uniform-memory-accessarchitectures-numa/[/url]

and then read the following and all the links at the bottom of it:

http://blogs.msdn.com/b/psssql/archive/2011/11/11/sql-server-clarifying-the-numa-configuration-information.aspx