All Xeon Models
 

A series of quick reference tables containing the main specs of all Xeon processors released to date, including Pentium II Xeon, Pentium III Xeon, Xeon, Xeon MP, dual-core Xeon and quad-core Xeon. Updated to include 45 nm models.

Here is a snippet:
"In 1998 Intel started including the name "Xeon" to label their processors targeted to the server and workstation market. These processors can access more RAM memory, can work on a multi-processing environment (i.e. motherboards with more than one CPU installed) and have a performance higher than their counterpart targeted to the end-user market. "