Hardware Secrets posted a 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.

"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. "

>> All Xeon Models