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Intel® Pentium® 4
processor-based platform

with the Intel® 850 chipset

Pentium® 4 Processor and Intel® 850 Chipset Diagrams and Pictures
Intel® 850 Chipset Platform Overview

The Intel® 850 chipset supports dual-channel RDRAM memory, delivering the most performance and headroom to maximize the performance of Pentium 4 processor-based systems.

As the next step in the evolution of Intel® Hub Architecture, the Intel 850 chipset was designed in tandem with the Intel® Pentium® 4 processor and innovative Intel® NetBurst" micro-architecture. Doubling the length of the pipeline between the processor and the chipset enables higher performance than ever before. To further eliminate bottlenecks, the Pentium 4 processor features a 400 MHz system bus that provides three times the bandwidth over previous technologies.

The Intel Pentium 4 processor also provides advanced dynamic execution to more accurately predict branch utilization. An execution trace cache stores decoded instructions, which removes the decoder from the main instruction loop. The Intel Pentium 4 processor also provides 144 new streaming SIMD Extension 2 instructions, with double precision floating point, 128-bit SIMD integer, and improved cache and memory management instructions.

Revolutionary Architecture

The 850 chipset is based on Intel® Hub Architecture, which delivers twice the I/O bandwidth as previous generation northbridge/ southbridge technology. With dedicated data paths to fully optimize the additional bandwidth, the Intel 850 chipset offers support for future Intel processors based on NetBurst micro-architecture, and delivers significant gains for desktop PCs and entry-level workstations.
  • The 82850 Memory Controller Hub (MCH) delivers dual RDRAM memory channels and a 400 MHz system bus, providing the latest graphics support through 1.5V AGP4X technology. Together these features deliver the highest total bandwidth capabilities to the PC platform.

  • The enhanced 82801BA I/O Controller Hub (ICH2) delivers twice the I/O bandwidth over traditional bridge architecture and provides dedicated data paths to fully optimize the additional bandwidth. The ICH2 makes a direct connection from the graphics and memory for faster access to peripherals and provides the features and bandwidth required for the extended PC.
In addition to advanced application support, the 850 chipset was designed with the following features to enhance the end-user experience of audio, video, entertainment and Internet applications.
  • 400 MHz system bus delivers a high bandwidth connection between the Intel Pentium 4 processor and the platform. To ensure maximum performance, the system bus is balanced with the dual RDRAM channels at 3.2GB/s, providing 3x the bandwidth of platforms based on Intel® Pentium® III processors.

  • Dual RDRAM memory channels, operating in lock step, deliver 3.2 GB/s of memory bandwidth to the processor. High memory bandwidth, coupled with an efficient protocol, deliver balanced platform support and provides the memory bandwidth necessary to extract full performance from the Intel Pentium 4 processor.

  • The AGP4X interface allows graphics controllers to access main memory at over 1 GB/s twice that of previous AGP platforms. With RDRAM memory and the new Intel Pentium 4 processor, AGP4X delivers the next level of 3D graphics performance.

  • Two USB controllers double the bandwidth available for USB peripherals to 24Mbps over four ports. This results in a significant increase over previous integrated 1-4 port hubs at 12Mbps.

  • The latest AC'97 audio delivers six channels of audio for enhanced sound quality and full surround sound capability for live broadcast and other Digital Dashboard programming.

  • LAN Connect Interface (LCI) provides flexible network solutions such as home phone line, 10/100Mbps Ethernet, and 10/100Mbps Ethernet with LAN manageability. All three network options utilize Intel® SingleDriver" Technology, which supports multiple products to simplify network connectivity and increase ease of deployment.

  • Dual Ultra ATA/100 controllers support the fastest IDE interface for transfers to storage devices. Additional performance is gained with the Intel® Application Accelerator over standard ATA drivers.

  • Communication and Networking 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 850 chipset offers innovative design, high-speed memory, and configuration options that optimize performance and provide a solid base for the Intel Pentium 4 processor.

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.

Intel® Application Accelerator: Accelerated boot time and disk I/O
Architecture Animation: Pentium® 4 Processor and 850 Chipset
Benchmarks: Intel® Pentium® 4 processor performance
Motherboards: Selector Guide
Comparison Chart: Chipsets
Tech Docs & Drivers
Software & Drivers: 850 Chipset
Design Guide: Pentium 4 Processor in 478-pin Package / 850 Chipset Platform
Design Guide: Pentium 4 Processor in 423-pin Package / 850 Chipset Platform
Customer Reference Board Schematics: 850 Chipset
Datasheet: 82850 Memory Controller Hub (MCH)
Specification Update: 82850 Memory Controller Hub (MCH)
Application Note: 850 Chipset Thermal Considerations (AP-720)
Datasheet: 82801BA I/O Controller Hub 2 (ICH2) and 82801BAM I/O Controller Hub 2 Mobile (ICH2-M)
Specification Update: 82801BA I/O Controller Hub 2 (ICH2) and 82801BAM I/O Controller Hub 2 (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 & Marketing
Why buy an 850 chipset-based RDRAM platform system?
Top 10 Platform Selling Points: 850 Chipset and Pentium 4 Processor
Selling Intel® Platforms:
Value of Intel® Chipsets and Software
Ad Builder: Photos and Ad Copy
Press Kit: Pentium 4 Processor Platform
Intel® Software Drivers: Value of Intel® Software and Drivers


400 MHz system bus Supports 400 MHz system bus for single processor configurations
Intel® Hub Architecture Increased I/O bus bandwidth allows better concurrency for media-rich applications and multitasking
Dual RDRAM capability Provides 3.2 GB/s memory bandwidth, balancing performance for the Pentium 4 processor based platform
AGP4X interface 2X increase in graphics bandwidth allows highest graphics performance.
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, doubling the bandwidth at 24 Mbps
Ultra ATA/100 Takes advantage of the latest industry innovations in HDD features and performance.
AC'97 Controller Better 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


82850 MCH 615 Organic Land Grid Array (OLGA)
82801BA ICH 360 Enhanced Ball Grid Array (EBGA)

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The Pentium 4 processor and 850 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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