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Intel® Pentium® 4
processor-based platform

with the Intel® 845 chipset
845 Chipset Platform Pictures

Intel® 845 Chipset Platform Overview

Optimally designed and extensively tested for the Intel® Pentium® 4 Processor, the Intel 845 chipset is designed to maximize the available bandwidth of DDR 200/266 or PC133 SDRAM for performance and mainstream systems.

845 Chipset System Diagram

Intel 845 Chipset Platform Overview

The Intel® Pentium® 4 processor delivers incredible performance for both consumer and corporate users. As Internet and digital media become pervasive, the Intel® NetBurst" micro-architecture powers exciting new uses in digital audio, video, photography, as well as enhanced 3D performance. For corporate users, the Pentium 4 processor offers excellent performance on today's office applications, with performance headroom (adding investment protection) for future applications.

The Pentium 4 processor was originally introduced with the support of the high-performance Intel® 850 chipset. The Intel® 845 chipset complements the 850 chipset, by offering support of high-volume, cost-effective PC133 SDRAM memory for the price-sensitive corporate users and extends the price/performance range for Pentium 4 processor systems by offering interoperable, higher bandwidth DDR200/266 SDRAM to the consumers.

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Evolutionary Architecture

The 845 chipset is designed, validated, and optimized for the Pentium 4 processor with NetBurst micro-architecture using proven and established building blocks. 845 chipset-based platforms extend the Pentium 4 processor capabilities to ensure cost-effective and high volume mainstream PCs are capable of supporting advanced, and ever-evolving, end-user desktop PC usage models.

The 845 chipset consists of two controller hubs:
  • The 82845 Memory Controller Hub (MCH) supports a 400 MHz system bus, PC133/DDR200/DDR266 SDRAM memory, and the latest graphics devices through the 1.5V AGP4X interface.

  • The 82801BA I/O Controller Hub (ICH2) makes a direct connection to the graphics and memory for faster access to peripherals. It provides the features and bandwidth required for extended PC usage models. The ICH2 is already one of the highest volume PC platform products in the world, supporting motherboards based on the Intel® 815, Intel® 810, and Intel 850 chipsets.
In addition to future application support, the 845 chipset was designed with the following features to deliver a compelling solution for both corporate and consumer market segments.
  • 400 MHz system bus delivers a high-bandwidth connection between the Pentium 4 processor and the platform, providing 3x the bandwidth over platforms based on Intel® Pentium® III processors.

  • Innovative architecture enhancements such as wider data paths and flexible memory refresh technology enable optimum PC133/DDR200/DDR266 SDRAM performance.

  • Advanced packaging technology and industry leading electrical design innovations ensure long-term system reliability over wide operating conditions.

  • PC133 SDRAM extends support of the highest volume, most cost-effective memory shipping today. This allows new system price points and configuration options for Pentium 4 processor-based platforms ideal for the corporate users.

  • High memory bandwidth of DDR200/266 SDRAM extends performance-price points to the consumers and channel buyers by providing exceptional performance across the full range of multi-media and 3D intensive applications while leveraging the cost benefits and reliability of SDRAM architecture.

  • The AGP4X interface continues to provide the most advanced graphics support available, enabling over 1 GB/s of graphics bandwidth.

  • Two USB controllers provide high-performance peripherals with 24Mbps of bandwidth, while enabling support for up to four USB ports. This results in a significant increase over previous integrated 1�4 port hubs at 12Mbps.

  • The latest AC97 implementation delivers six channels of audio for enhanced sound quality and full surround sound capability. Integrated audio solutions continue to enjoy success as a very cost-effective, yet high-performance solution.

  • LAN Connect Interface (LCI) provides flexible network solutions such as home phone line, 10/100Mbps Ethernet, and 10/100Mbps Ethernet with LAN manageability.

  • The Intel® SingleDriver" Technology supports all three network options, which simplifies network connectivity and eases deployment.

  • Dual Ultra ATA/100 controllers coupled with the Intel® Application Accelerator, a performance software package, support faster IDE transfers to storage devices.

  • The Intel® Application Accelerator software improves system performance by improving I/O transfer rates and enables faster O/S load time resulting in accelerated boot times.

  • Communication and Network Riser (CNR) offers flexibility in system configuration with a baseline feature set that can be upgraded with an audio card, modem card, or network card.
The Intel 845 chipset offers innovative design, high-volume memory support, and configuration options that optimize performance and provide a robust, mainstream platform for the Intel Pentium 4 processor.

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Selling Intel® Platforms: Value of Intel® Chipsets and Software

The Internet and advanced applications are creating the opportunity to think in new ways, and Intel has risen to the challenge by designing a platform that meets today's business needs while still designed for compatibility with technology that is under development. Intel's new platform architecture delivers the superior performance and high scalability required for today's exciting e-Business and e-Home applications. Our comprehensive efforts to enable the industry ensure fast deployment of next-generation platforms, maximizing your competitive advantage. And Intel's world-class platform validation creates a robust foundation for emerging applications, while minimizing deployment risks.

Open New Markets with DDR Support: Intel® 845 Chipset and Desktop Boards PDF 34K
Intel® Application Accelerator: Accelerate boot time and disk I/O
Benchmarks: Intel® Pentium® 4 processor performance
Motherboards: Selector Guide
Comparison Chart: Chipsets
Tech Docs & Drivers
Software & Drivers: 845 Chipset
Development Tools: 845 Chipset
Platform Design Guide: Pentium 4 Processor in 478-pin Package and 845 Chipset Platform for DDR
Design Guidelines: 845 Chipset Thermal and Mechanical for DDR
Datasheet: 845 Chipset Memory Controller Hub (MCH) for DDR
Specification Update: 845 Chipset Memory Controller Hub (MCH) For DDR
Platform Design Guide: Pentium 4 Processor in 478-pin Package and 845 Chipset Platform for SDR
Design Guidelines: 845 Chipset Thermal Mechanical for SDR
Datasheet: 845 Chipset Memory Controller Hub (MCH) for SDR
Specification Update: 845 Chipset Memory Controller Hub (MCH) for SDR
Datasheet: 82801BA I/O Controller Hub 2 (ICH2) and 82801BAM I/O Controller Hub 2 (ICH2-M)
Specification Update: 82801BA ICH2 and 82801BAM ICH2-M
Application Note: AP-728 ICH Family Real Time Clock (RTC) Accuracy and Considerations under Test Conditions
Datasheets: Pentium® 4 Processor
Design Guides: Pentium® 4 Processor
Datasheet: 82802AB/82802AC Firmware Hub (FWH)
Programmer's Reference Manual: 82802 Firmware Hub Random Number Generator
AGP Retention Mechanism
Sales and Marketing
Why buy an 845 chipset-based DDR platform system, PDF 196K
Why buy an 845 chipset-based PC133 SDRAM platform system, PDF 160K
Ad Builder: Photos and Ad Copy
Press Kit: Pentium 4 Processor Platform
Selling Intel® Platforms:
Value of Intel® Chipsets and Software
Intel® 845 Chipset Features & Benefits


400 MHz system bus Increased system bandwidth for greater system responsiveness and seamless user interaction
256 bit Internal data paths 4x the internal data transfer capability over previous generations
Intel® Hub Architecture Dedicated data paths to deliver maximum bandwidth for I/O intensive applications
DDR 200/266 or PC133 SDRAM Choice of memory technology to support a full range of price/performance requirements
AGP4X interface High-bandwidth interface for high-quality 2D, 3D, and video streams
LAN connect interface Multiple networking options taking advantage of Intel® SingleDriver" technology
Alert on LAN* 1.0 Emits an alert in case of software failures or system intrusion, even when the O/S is not present or the system is suspended
Dual USB controllers Two controllers for four ports, delivering a total USB bandwidth of 24 Mbps
Ultra ATA/100 Takes advantage of the latest industry innovations in HDD features and performance
Intel® Application Accelerator Software that helps accelerate boot time and application launch times
AC97 Controller Excellent audio quality, with up to six channels for full surround sound capability including a simultaneous modem connection
Communications Network Riser Card Allows flexibility for multiple configurations on a single card to extend USB, LAN, and audio
Low-power sleep mode Energy savings


Intel® Pentium® 4 Processor 478 Flip Chip Pin Grid Array (FCPGA)
82845 MCH 593 Flip Chip Ball Grid Array (FCBGA)
82801BA ICH2 360 Enhanced Ball Grid Array (EBGA)

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The Pentium 4 processor and 845 chipset may contain design defects or errors known as errata which may cause the product to deviate from published specifications. Current characterized errata are available on request.

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