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Encyclopedia > Intel Xeon


The Xeon is Intel's current generation of server-class microprocessors for PCs. The first Xeon processor was released in 1998 as the Pentium II Xeon.


The Pentium II Xeon uses either a 440GX or 450NX chipset. In 2000, the Pentium II Xeon was replaced by the Pentium III Xeon.


In 2001, the Pentium III Xeon was replaced with the Intel Xeon processor. The Xeon is based on Intel's NetBurst architecture and is similar to the Pentium 4 CPU.


The latest addition to the Xeon family is the Xeon MP processor, released in 2002, which combined NetBurst with Intel's HyperThreading technology. Its chipsets use socket 603 and has GC-LE versions for the low end (2 processors, 16 Gb memory addressable) and GC-HE for the high end (4 processors or more, 64 Gb addressable), all using a 400Mhz bus.


Like Intel's standard x86/IA-32 family of consumer desktop PC processors, the Xeon line of processors are 32-bit. A 64-bit version of the Xeon is planned and will compliment (or potentially replace) Intel's much less successful Itanium CPU.


On May 9, 2004, Intel announced that future Xeon processors would be based on the company's Pentium M architecture. Interestingly, the Pentium M is based strongly on Intel's Pentium III architecture, so "new" Xeon may actually be more similar to the Pentium III Xeon than the NetBurst-based Xeons.


Irwindale

The Irwindale core will be introduced in H1 2005. It will be identical to the Nocona, but with a doubled L2 cache.


See also: List of Intel microprocessors

Xeon Processors, Designations, and Characteristics
Public Desigination Core (Intel Codename) CPU Frequency Frontside Bus Frequency / Theoretical Bandwidth Cache Interface Additional Features
Pentium II Xeon Drake 400MHz-450MHz 100 MHz / 800MB/s 16K L1 data + 16K L1 instruction; 512KB/1MB/2MB L2 Slot 2 N/A
Pentium III Xeon Tanner 500MHz-550MHz 100 MHz / 800MB/s 16K L1 data + 16K L1 instruction; 512KB/1MB/2MB L2 Slot 2 Support of SSE instructions and Processor Serial Number
Pentium III Xeon Cascades 600MHz-1000MHz 133 MHz / 1066MB/s 16K L1 data + 16K L1 instruction; 256KB L2 Slot 2 On-Die L2 Cache
Pentium III Xeon Cascades 2MB 700MHz-900MHz 100 MHz / 800MB/s 16K L1 data + 16K L1 instruction; 2MB L2 Slot 2 Larger L2 cache, and support for more than 2-way configurations
Xeon Foster 1400MHz-2000MHz 100 MHz / 3.2GB/s 8K L1 data + 12K L1 instruction; 256KB L2 Socket 603 Based on Pentium 4's Netburst core; supports SSE2 and removes Processor Serial Number
Xeon MP Foster MP 1400MHz-1600MHz 100 MHz / 3.2GB/s 8K L1 data + 12K L1 instruction; 256KB L2; 512K/1MB L3 Socket 603 Adds L3 cache, and support for more than 2-way configurations
Xeon Prestonia 1600MHz-2800MHz 100 MHz / 3.2GB/s 8K L1 data + 12K L1 instruction; 512KB L2 Socket 603 Supports Hyper-Threading
Xeon Prestonia 2000MHz-3060MHz 133 MHz / 4.2GB/s 8K L1 data + 12K L1 instruction; 512KB L2 Socket 604 Faster Front-Side Bus
Xeon Gallatin 3060MHz-3200MHz 133 MHz / 4.2GB/s 8K L1 data + 12K L1 instruction; 512KB L2; 1MB L3 Socket 604 Adds 1MB of L3 cache
Xeon MP Gallatin 1500MHz-3000MHz 100 MHz / 3.2GB/s 8K L1 data + 12K L1 instruction; 512KB L2; 1MB/2MB/4MB L3 Socket 603 Adds L3 cache, and support for more than 2-way configurations
Xeon Nocona 2800MHz-3600MHz 200 MHz / 6.4GB/s 16K L1 data + 12K L1 instruction; 1MB L2 Socket 604 Larger caches; support for SSE3, EM64T and the NX (No eXecute) bit.

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