<processor> The successor to Intel Corporation's {Pentium II} processor. The Xeon has the same P6 core as existing {Pentium Pro}/Pentium II units, but it supports a 100 MHz system bus and offers as much as 2 MB of level 2 cache. xeon/home.htm">http://intel.com/PentiumII/xeon/home.htm. (1998-09-09)

<processor> Intel Corporation's successor to the {Pentium Pro}. The Pentium II can execute all the instructions of all the earlier members of the Intel 80x86 processor family. There are four versions targetted at different user markets. The Celeron is the simplest and cheapest. The standard Pentium II is aimed at mainstream home and business users. The Pentium II Xeon is intended for higher performance business servers. There is also a mobile version of the Pentium II for use in portable computers. All versions of the Pentium II are packaged on a special daughterboard that plugs into a card-edge processor slot on the motherboard. The daughterboard is enclosed within a rectangular black box called a Single Edge Contact (SEC) cartridge. The budget Celeron may be sold as a card only without the box. Consumer line Pentium II's require a 242-pin slot called Slot 1. The Xeon uses a 330-pin slot called Slot 2. Intel refers to Slot 1 and Slot 2 as SEC-242 and SEC-330 in some of their technical documentation. The daughterboard has mounting points for the Pentium II CPU itself plus various support chips and cache memory chips. All components on the daughterboard are normally permanently soldered in place. Previous generation Socket 7 motherboards cannot normally be upgraded to accept the Pentium II, so it is necessary to install a new motherboard. All Pentium II processors have Multimedia Extensions (MMX) and integrated Level One and Level Two cache controllers. Additional features include Dynamic Execution and Dual Independent Bus Architecture, with separate 64 bit system and cache busses. Pentium II is a superscalar CPU having about 7.5 million transistors. The first Pentium II's produced were code named Klamath. They were manufactured using a 0.35 micron process and supported clock rates of 233, 266, 300 and 333 MHz at a bus speed of 66 MHz. Second generation Pentium II's, code named Deschutes, are made with a 0.25 micron process and support rates of 350, 400 and 450 MHz at a bus speed of 100 MHz. http://intel.com/PentiumII/. (1998-10-06)

Pentium II

Pentium II Xeon

Pentium is a brand used for a series of x86 architecture-compatible microprocessors produced by Intel. The original Pentium was released in 1993.

<processor> Intel's superscalar successor to the 486. It has two 32-bit 486-type integer pipelines with dependency checking. It can execute a maximum of two instructions per cycle. It does pipelined floating-point and performs branch prediction. It has 16 kilobytes of on-chip cache, a 64-bit memory interface, 8 32-bit general-purpose registers and 8 80-bit floating-point registers. It is built from 3.1 million transistors on a 262.4 mm^2 die with Pentium2.3 million transistors in the core logic. Its clock rate is 66MHz, heat dissipation is 16W, integer performance is 64.5 SPECint92, floating-point performance 56.9 SPECfp92. It is called "Pentium" because it is the fifth in the 80x86 line. It would have been called the 80586 had a US court not ruled that you can't trademark a number. The successors are the Pentium Pro and Pentium II. The following Pentium variants all belong to "x86 Family 6", as reported by "Microsoft Windows" when identifying the CPU: Model Name 1 Pentium Pro 2 ? 3 Pentium II 4 ? 5, 6 Celeron or Pentium II 7 Pentium III 8 Celeron uPGA2 or Mobile Pentium III A {pentium/FAQ">floating-point division bug (ftp://ftp.isi.edu/pub/carlton/pentium/FAQ)} was discovered in October 1994. [Internal implementation, "Microprocessor Report" newsletter, 1993-03-29, volume 7, number 4]. [Pentium based computers, PC Magazine, 1994-01-25]. (2003-09-30)

<processor, Intel> The microprocessor that was {Intel Corporation}'s successor to the Pentium II, introduced in 1999 with a 500 MHz clock rate. The Pentim III is very similar to the Pentium II in architecture. Its external bus can be clocked at 100 or 133 MHz, it can have up to 512 KB of secondary cache, and it comes in various packages including SECC2 and FC-PGA. The Pentium III has a P6 Dynamic Execution microarchitecture, a multi-transaction system bus, and MMX, like the Pentium II. It adds Dual Independent Bus (DIB) Architecture, the Intel Processor Serial Number, Internet Streaming SIMD Extensions, 70 new instructions. Some versions also include an Advanced Transfer Cache and Advanced System Buffering. When Intel released a 1.13 GHz version of the Pentium III processor using a 0.18 micron fabrication process on 2000-07-31, it was the world's highest performance microprocessor for PCs. http://intel.com/PentiumIII. (2000-10-05)

<processor> (Known as "P6" during development) Intel's successor to the Pentium processor, in development Jan 1995, generally available 1995-11-01. The P6 has an internal RISC architecture with a CISC-RISC translator, 3-way superscalar execution, and out-of order execution (or "speculative execution", which Intel calls "{Dynamic Execution}"). It also features branch prediction and register renaming, and is superpipelined (14 stages). The P6 is made as a two-chip assembly: the first chip is the CPU and 16 kilobyte first-level cache (5.5 million transistors) and the other is a 256 (or 512) kilobyte second-level cache (15 million transistors). The first version has a clock rate of 133 Mhz and consumes about 20W of power. It is about twice as fast as the 100 MHz Pentium. The original 0.35 micron versions of the Pentium Pro released on 1995-11-01 run at 150 and 166 Mhz for desktop machines and up to 200 Mhz for servers. Heat disspation is about 20 Watts. The Pentium Pro is optimised for 32-bit software and runs 16-bit software slower than the original Pentium. The successor was the Pentium II. [Performance?] (1996-03-01)

The Pentium Pro is a sixth-generation x86 microprocessor developed and manufactured by Intel and introduced on November 1, 1995. It introduced the P6 microarchitecture (sometimes termed i686) and was originally intended to replace the original Pentium in a full range of applications.

Pentium III