Searching Intel's web site turns up the following link and information:

http://support.intel.com/support/processors/sb/1047078283579359-prd24.htm

A processor's family, model and stepping numbers refer to the manufacturing process on which a processor was manufactured and can be useful in identifying a processor in a system. The family, model and stepping numbers do not directly translate to a specific processor, and should not be used as a tool to identify a specific processor.
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Dean