Intel Xeon UP/DP (Kentsfield) processors
Introduction: January 2007
The Xeon brand refers to many families of Intel's x86 multiprocessing CPUs - for dual-processor (DP) and multi-processor (MP) configuration on a single motherboard targeted at non-consumer markets of server and workstation computers, and also at blade servers and embedded systems. The Xeon brand has been maintained over several generations of x86 and x86-64 processors. Older models added the Xeon moniker to the end of the name of their corresponding desktop processor, but more recent models used the name Xeon on its own. The Xeon CPUs generally have more cache than their desktop counterparts in addition to multiprocessing capabilities. Intel's (non-x86) IA-64 processors are called Itanium, not Xeon.
The Kentsfield core
Intel released relabeled versions of its quad-core (2x2) Core 2 Quad processor as the Xeon 3200-series (product code 80562) on 7 January 2007. The 2x2 quad-core comprised two separate dual-core die next to each other in one CPU package. The models were the X3210, X3220 and X3230, running at 2.13, 2.4 and 2.66GHz, respectively. Like the 3000-series, these models only supported single-CPU operation and operate on a 1066MHz front-side bus. It was targeted at the "blade" market.
Source: Wikipedia, the free encyclopedia.