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Encyclopedia > Pentium II
Pentium II
Central processing unit

A Slot 1 Pentium II – front view
Produced: From mid 1997 to early 1999
Manufacturer: Intel
CPU Speeds: 233 MHz to 450 MHz
FSB Speeds: 66 MHz to 100 MHz
Process:
(MOSFET channel length)
0.35 µm to 0.25 µm
Instruction Set: x86
Microarchitecture: P6
Sockets:
Cores:
  • Klamath
  • Tonga
  • Deschutes
  • Dixon
Intel Pentium II Logo

The Pentium II is an x86 architecture microprocessor by Intel, introduced on May 7, 1997. It is based on a modified version of the P6 core first used for the Pentium Pro. Die of an Intel 80486DX2 microprocessor (actual size: 12×6. ... Pentium II - front view This image has been released into the public domain by the copyright holder, its copyright has expired, or it is ineligible for copyright. ... Slot 1 refers to the physical and electrical specification for the connector used by some of Intels microprocessors, including the Celeron, Pentium II and the Pentium III. Slot 1 was a departure from the square ZIF PGA/SPGA sockets used for the Pentium and earlier processors. ... Intel Corporation (NASDAQ: INTC, SEHK: 4335), founded in 1968 as Integrated Electronics Corporation, is an American multinational corporation that is best known for designing and manufacturing microprocessors and specialized integrated circuits. ... Die of an Intel 80486DX2 microprocessor (actual size: 12×6. ... A megahertz (MHz) is one million (106) hertz, a measure of frequency. ... A megahertz (MHz) is one million (106) hertz, a measure of frequency. ... In computers, the front side bus (FSB) or system bus is the physical bi-directional data bus that carries all electronic signal information between the central processing unit (CPU) and other devices within the system such as random access memory (RAM), video cards, PCI expansion cards, hard disks, the memory... A megahertz (MHz) is one million (106) hertz, a measure of frequency. ... A megahertz (MHz) is one million (106) hertz, a measure of frequency. ... The metal-oxide-semiconductor field-effect transistor (MOSFET, MOS-FET, or MOS FET) is by far the most common field-effect transistor in both digital and analog circuits. ... It has been suggested that some sections of this article be split into a new article entitled instruction set architecture. ... x86 or 80x86 is the generic name of a microprocessor architecture first developed and manufactured by Intel. ... Microarchitecture consists of a set of microprocessor design techniques used to implement the instruction set (including microcode, pipelining, cache systems, etc. ... The P6 microarchitecture is the sixth generation Intel x86 microprocessor architecture, released in 1995. ... Slot 1 refers to the physical and electrical specification for the connector used by some of Intels microprocessors, including the Celeron, Pentium II and the Pentium III. Slot 1 was a departure from the square ZIF PGA/SPGA sockets used for the Pentium and earlier processors. ... Mobile Module 1, Intels 280 pin processor cartridge used with Pentium/MMX, Pentium II and Celeron mobile processors. ... Mobile Module 2, Intels 400 pin processor cartridge used with Pentium II, Celeron and Pentium III mobile processors. ... Intels 240 pin cartridge for their mobile Pentium II processors. ... Intel Pentium II Logo The Pentium II is an x86 architecture microprocessor by Intel, introduced on May 7, 1997. ... Image File history File links This is a lossless scalable vector image. ... Image File history File links This is a lossless scalable vector image. ... x86 or 80x86 is the generic name of a microprocessor architecture first developed and manufactured by Intel. ... A microprocessor is a programmable digital electronic component that incorporates the functions of a central processing unit (CPU) on a single semiconducting integrated circuit (IC). ... Intel Corporation (NASDAQ: INTC, SEHK: 4335), founded in 1968 as Integrated Electronics Corporation, is an American multinational corporation that is best known for designing and manufacturing microprocessors and specialized integrated circuits. ... is the 127th day of the year (128th in leap years) in the Gregorian calendar. ... Year 1997 (MCMXCVII) was a common year starting on Wednesday (link will display full 1997 Gregorian calendar). ... The P6 microarchitecture is the sixth generation Intel x86 microprocessor architecture, released in 1995. ... The Pentium Pro is a sixth-generation x86 architecture microprocessor (P6 core) produced by Intel and was originally intended to replace the original Pentium in a full range of applications, but later, was reduced to a more narrow role as a server and high-end desktop chip. ...

Contents

Overview

Pentium II is largely based upon its predecessor, Pentium Pro. However, there are some significant changes to the design of the processor.


Unlike previous Intel processors such as the Pentium and Pentium Pro, the Pentium II was packaged in a slot-based form-factor rather than a socket. The chip and associated components were carried on a daughterboard similar to a typical expansion board within a plastic cartridge. A fixed or removable heatsink was carried on one side, sometimes using its own fan.[1] Slot 1 refers to the physical and electrical specification for the connector used by some of Intels microprocessors, including the Celeron, Pentium II and the Pentium III. Slot 1 was a departure from the square ZIF PGA/SPGA sockets used for the Pentium and earlier processors. ... The form factor of a device is its linear dimensions and configuration, as distinguished from other measures of size (for example Gigabytes, a measure of storage size). ... A socket generally designates a cavity or region used for fitting and connecting some specific device. ... A daughterboard or daughtercard is a circuit board meant to be an extension or daughter of a motherboard (or mainboard), or occasionally another card. ... A large copper heatsink. ...


This larger package was a compromise allowing Intel to separate the secondary cache from the processor while still keeping it on a closely coupled backside bus. This separate cache was slower (running at half of the processor speed) than that in the Pentium Pro, but the smallest cache size was increased to 512 KiB from the 256 KiB on the Pentium Pro. Off-package cache solved the Pentium Pro's low yields, allowing Intel to introduce the Pentium II at a mainstream price level.[2][3] This arrangement also allowed Intel to easily vary the amount of L2 cache, thus making it possible to target different market segments with cheaper or more expensive processors and accompanying performance levels. Diagram of a CPU memory cache A CPU cache is a cache used by the central processing unit of a computer to reduce the average time to access memory. ... The term backside bus was used most commonly when referring to Intels Pentium Pro. ...


Intel notably improved 16-bit code execution performance on Pentium II, an area in which Pentium Pro was at a notable handicap. Most consumer software of the day was still using at least some 16-bit code, because of a variety of factors. The Pentium II went to 32 KiB of L1 cache, double that of Pentium Pro, as well. Pentium II is also the first P6-based CPU to implement the Intel MMX integer SIMD instruction set which had already been introduced on the Pentium MMX.[2] In computer science, 16-bit is an adjective used to describe integers that are at most two bytes wide, or to describe CPU architectures based on registers, address buses, or data buses of that size. ... MMX is a SIMD instruction set designed by Intel, introduced in 1997 in their Pentium MMX microprocessors. ... -1... Pentium MMX - top view The Pentium is a fifth-generation x86 architecture microprocessor by Intel which first shipped on March 22, 1993. ...


Pentium II is basically a more consumer-oriented version of the Pentium Pro. It was cheaper to manufacture because of the separate, slower L2 cache memory. The improved 16-bit performance and MMX support made it a better choice for consumer-level operating systems, such as Windows 9x, and multimedia applications. Combined with the larger L1 cache and improved 16-bit performance, the slower and cheaper L2 cache's performance impact was minimized. General processor performance maximized while costs were cut.[2][4] Windows 9x is a term used to describe the DOS-based operating systems Windows 95 and Windows 98, similar versions of Microsoft Windows which were produced in the 1990s. ...


Variations

The original Klamath Pentium II (Intel product code 80522) ran at 233 and 266 MHz, were produced in a 0.35 µm fabrication process.[5][2] A 300 MHz version was released later in 1997.[5] These CPUs worked with a 66 MHz front side bus and initially were used on motherboards equipped with the aging Intel 440FX Pentium Pro chipset.[6] MegaHertz (MHz) is the name given to one million (106) Hertz, a measure of frequency. ... A micrometre (American spelling: micrometer, symbol µm) is an SI unit of length equal to one millionth of a metre, or about a tenth of the diameter of a droplet of mist or fog. ... In computers, the front side bus (FSB) or system bus is the physical bi-directional data bus that carries all electronic signal information between the central processing unit (CPU) and other devices within the system such as random access memory (RAM), video cards, PCI expansion cards, hard disks, the memory... This is a list of computer motherboard chipsets made by Intel. ...


The Deschutes core Pentium II (80523), which debuted at 333 MHz in January 1998, was produced in a more suitable 0.25 µm fabrication process.[5] The 333 MHz variant was the final Pentium CPU used with the legacy 66 MHz front side bus. Support for a 100 MHz front side bus speed heralded solid performance improvements. During 1998, Pentium IIs running at 266, 300, 350, 400, and 450 MHz were also released.[5] Pentium II-based systems using the Intel 440LX chipset were the first to utilize the new generation RAM-standard, SDRAM (which replaced EDO RAM), and the AGP graphics bus.[7] A micrometre (American spelling: micrometer, symbol µm) is an SI unit of length equal to one millionth of a metre, or about a tenth of the diameter of a droplet of mist or fog. ... In computers, the front side bus (FSB) or system bus is the physical bi-directional data bus that carries all electronic signal information between the central processing unit (CPU) and other devices within the system such as random access memory (RAM), video cards, PCI expansion cards, hard disks, the memory... Year 1998 (MCMXCVIII) was a common year starting on Thursday (link will display full 1998 Gregorian calendar). ... This is a list of computer motherboard chipsets made by Intel. ... This article or section does not cite any references or sources. ... Dynamic random access memory (DRAM) is a type of random access memory that stores each bit of data in a separate capacitor within an integrated circuit. ... This article does not cite any references or sources. ...


The Pentium II Xeon was a high-end version intended for use on servers. Principally, it used a different type of slot (Slot 2), case, board design and used expensive full-speed custom L2 cache, which was again off-die. Versions were produced with 512 KiB, 1 MiB or 2 MiB L2 caches by varying the number of 512 KiB chips incorporated on the board.[8] The Xeon is Intels brand name for its server-class x86 microprocessors intended for multiple-processor machines. ... This article does not cite any references or sources. ... Slot 2 refers to the physical and electrical specification for the 330-lead edge-connector used by some of Intels microprocessors, including the Pentium II and Pentium III. Slot 2 is intended for use in high end multi-processor workstations and servers. ...


The 0.25 μm "Tonga" core was the first mobile Pentium II and had all of the features of the desktop models. A mobile version with 256 KiB of on-die, full speed cache was produced late in the Pentium II's lifecycle. This "Dixon" core was the fastest type of Pentium II produced.[5]


In early 1999, the Pentium III superseded the Pentium II. Pentium III logo The Pentium III is an x86 (more precisely, an i686) architecture microprocessor by Intel, introduced on February 26, 1999. ...


Models

Desktop

Pentium II with plastic covering removed, showing the L2 cache and in the middle the cache controller chip.

Pentium II - inside front view This image has been released into the public domain by the copyright holder, its copyright has expired, or it is ineligible for copyright. ... Pentium II - inside front view This image has been released into the public domain by the copyright holder, its copyright has expired, or it is ineligible for copyright. ...

Klamath (80522)

  • L1 cache: 16 + 16 KiB (Data + Instructions)
  • L2 cache: 512 KiB, external chips on CPU module with 50% of CPU-speed
  • Slot 1 (GTL+)
  • MMX
  • Front side bus: 66 MHz
  • VCore: 2.8 V
  • Fabrication: 0.35 µm
  • First release: May 7, 1997
  • Clockrate: 233, 266, 300 MHz

Slot 1 refers to the physical and electrical specification for the connector used by some of Intels microprocessors, including the Celeron, Pentium II and the Pentium III. Slot 1 was a departure from the square ZIF PGA/SPGA sockets used for the Pentium and earlier processors. ... MMX is a SIMD instruction set designed by Intel, introduced in 1997 in their Pentium MMX microprocessors. ... In computers, the front side bus (FSB) or system bus is the physical bi-directional data bus that carries all electronic signal information between the central processing unit (CPU) and other devices within the system such as random access memory (RAM), video cards, PCI expansion cards, hard disks, the memory... is the 127th day of the year (128th in leap years) in the Gregorian calendar. ... Year 1997 (MCMXCVII) was a common year starting on Wednesday (link will display full 1997 Gregorian calendar). ...

Deschutes (80523)

  • L1 cache: 16 + 16 KiB (Data + Instructions)
  • L2 cache: 512 KiB, external chips on CPU module with 50% of CPU-speed
  • Slot 1 (GTL+)
  • MMX
  • Front side bus: 66, 100 MHz
  • VCore: 2.0 V
  • Fabrication: 0.25 µm
  • First release: January 26, 1998
  • Clockrate: 266 - 450 MHz
    • 66 MHz FSB : 266, 300, 333 MHz
    • 100 MHz FSB: 350, 400, 450 MHz

Slot 1 refers to the physical and electrical specification for the connector used by some of Intels microprocessors, including the Celeron, Pentium II and the Pentium III. Slot 1 was a departure from the square ZIF PGA/SPGA sockets used for the Pentium and earlier processors. ... MMX is a SIMD instruction set designed by Intel, introduced in 1997 in their Pentium MMX microprocessors. ... In computers, the front side bus (FSB) or system bus is the physical bi-directional data bus that carries all electronic signal information between the central processing unit (CPU) and other devices within the system such as random access memory (RAM), video cards, PCI expansion cards, hard disks, the memory... is the 26th day of the year in the Gregorian calendar. ... Year 1998 (MCMXCVIII) was a common year starting on Thursday (link will display full 1998 Gregorian calendar). ...

Mobile

Tonga (80523)

mobile Pentium II

  • L1 cache: 16 + 16 KiB (Data + Instructions)
  • L2 cache: 512 KiB, external chips on CPU module with 50% of CPU-speed
  • MMC-1, MMC-2, Mini-Cartridge (GTL+)
  • MMX
  • Front side bus: 66 MHz
  • VCore: 1.6 V
  • Fabrication: 0.25 µm
  • First release: June 7, 1997
  • Clockrate: 233, 266, 300 MHz

Mobile Module 1, Intels 280 pin processor cartridge used with Pentium/MMX, Pentium II and Celeron mobile processors. ... Mobile Module 2, Intels 400 pin processor cartridge used with Pentium II, Celeron and Pentium III mobile processors. ... Intels 240 pin cartridge for their mobile Pentium II processors. ... MMX is a SIMD instruction set designed by Intel, introduced in 1997 in their Pentium MMX microprocessors. ... In computers, the front side bus (FSB) or system bus is the physical bi-directional data bus that carries all electronic signal information between the central processing unit (CPU) and other devices within the system such as random access memory (RAM), video cards, PCI expansion cards, hard disks, the memory... June 7 is the 158th day of the year in the Gregorian calendar (159th in leap years), with 207 days remaining. ... Year 1997 (MCMXCVII) was a common year starting on Wednesday (link will display full 1997 Gregorian calendar). ...

Dixon (80524)

mobile Pentium II PE ("Performance Enhanced")

  • L1 cache: 16 + 16 KiB (Data + Instructions)
  • L2 cache: 256 KiB, on-die, full CPU speed
  • BGA1, MMC-1, MMC-2, μPGA1 (GTL+)
  • MMX
  • Front side bus: 66, 100 MHz
  • VCore: 1.5, 1.55, 1.6 V, 2.0 V
  • Fabrication: 0.25 µm
  • First release: January 25, 1999
  • Clockrate: 266 - 400 MHz

Intels ball grid array package for their Pentium II and early Celeron mobile processors. ... Mobile Module 1, Intels 280 pin processor cartridge used with Pentium/MMX, Pentium II and Celeron mobile processors. ... Mobile Module 2, Intels 400 pin processor cartridge used with Pentium II, Celeron and Pentium III mobile processors. ... It has been suggested that this article or section be merged with Micro-PGA2. ... MMX is a SIMD instruction set designed by Intel, introduced in 1997 in their Pentium MMX microprocessors. ... In computers, the front side bus (FSB) or system bus is the physical bi-directional data bus that carries all electronic signal information between the central processing unit (CPU) and other devices within the system such as random access memory (RAM), video cards, PCI expansion cards, hard disks, the memory... is the 25th day of the year in the Gregorian calendar. ... Year 1999 (MCMXCIX) was a common year starting on Friday (link will display full 1999 Gregorian calendar). ...

References

  1. ^ Pabst, Thomas. Intel's Slot 1 CPUs Uncovered, Tom's Hardware, May 3, 1998.
  2. ^ a b c d Pabst, Thomas. The Intel Pentium II ('Klamath') CPU, Tom's Hardware, March 1, 1997.
  3. ^ Lal Shimpi, Anand. Intel Pentium II, Anandtech, May 30, 1997.
  4. ^ Pabst, Thomas. The Empire Strikes Back: Intel's Pentium II CPU, Tom's Hardware, April 30, 1997.
  5. ^ a b c d e IA-32 implementation Intel P2 (incl. Celeron and Xeon), SandPile.org, accessed May 5, 2007.
  6. ^ Intel 440FX, PCGuide, accessed May 5, 2007.
  7. ^ Intel 440LX, PCGuide, accessed May 5, 2007.
  8. ^ Pabst, Thomas. Intel's Pentium II Xeon Processor, Tom's Hardware, July 2, 1998.

External links


  Results from FactBites:
 
Pentium II - Wikipedia, the free encyclopedia (789 words)
The Pentium II is an x86 architecture microprocessor by Intel, introduced on May 7, 1997.
The original Klamath Pentium II ran at 233 and 266 MHz, were produced in a 0.35 µm fabrication process and produced (for that time) an incredible amount of heat.
By early 1999, the Pentium III superseded the Pentium II.
Pentium - Wikipedia, the free encyclopedia (952 words)
Pentium OverDrive processors were released at speeds of 63 and 83 MHz as an upgrade option for older 486-class computers.
The original Pentium microprocessor had the internal code name P5, and was a pipelined in-order superscalar microprocessor, produced using a 0.8 µm process.
The Pentium brand is traditionally used for desktop and notebook parts, the Celeron brand is used for "value" parts (typically lower performance and lower price), and the Xeon brand is used for high-performance parts suitable for servers and workstations.
  More results at FactBites »

 
 

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