The IntelR 840 chipset was specifically designed to meet the needs of high performance multi-processor systems. The 840 chipset, together with the latest IntelR PentiumR III or IntelR PentiumR III Xeon? processors, provides new levels of performance,
scalability, and end user productivity.
A New Design with Big Benefits
The Intel 840 chipset utilizes the new modular design of the 800 family of chipsets. Like other 800 series chipsets, the 840 chipset has three core components:
The 82840 Memory Controller Hub (MCH) differentiates the Intel 840 chipset from other Intel 800 series chipsets. The MCH provides graphics support for AGP 2X/4X, dual RDRAM memory channels, and multiple PCI segments for high performance I/O.
The 82801 I/O Controller Hub (ICH) utilizes IntelR Accelerated Hub Architecture to make a direct connection to the MCH. The ICH supports 32-bit PCI, IDE controllers and dual USB ports.
The 82802 Firmware Hub (FWH) stores system BIOS and video BIOS, as well as an IntelR Random Number Generator (RNG). The Intel RNG provides truly random numbers to enable stronger encryption, digital signing and security protocols.
In addition to providing high performance, the Intel 840 chipset was designed for scalability. Three components may be used with the core components:
The 82806 64-bit PCI Controller Hub (P64H) supports 64-bit PCI slots at speeds of either 33 or 66 MHz. The P64H connects directly to the MCH using Intel Accelerated Hub Architecture, providing a dedicated path for high performance I/O.
For systems needing high RDRAM capacity, an 82803 RDRAM-based memory repeater hub (MRH-R) may be utilized. The MRH-R converts each memory channel into two memory channels for expanded memory capacity.
For systems needing high SDRAM capacity, an 82804 SDRAM-based memory repeater hub (MRH-S) may be utilized. The MRH-S efficiently translates the RDRAM protocol into SDRAM-based signals for system memory flexibility.
New Features Maximize Performance
Dual memory channels, operating in lock-step, provide up to 3.2 GB/s of either RDRAM or SDRAM memory bandwidth.
A 16-bit wide implementation of Accelerated Hub Architecture allows high performance concurrent PCI I/O with a P64H.
The Direct AGP port provides up to 1 GB/s of graphics bandwidth.
Supports processors using a 133 MHz system bus.
A prefetch cache, unique to the 840 chipset, allows highly efficient data flow and helps maximize system concurrency.
FEATURES BENEFITS
Validated with IntelR PentiumR III and IntelR PentiumR III Xeon? processors Brings next generation processor technology to the workstation and server market segments
133 MHz system bus capability Supports latest Intel processors
IntelR Accelerated Hub Architecture with optional P64H 800 MB/s of I/O bus bandwidth supports for fast drive access and high speed networks
AGP 4X capability 1 GB/s of graphics bandwidth allows highest graphics performance on IA platforms
MRH-R (RDRAM based repeater hub) Extends RDRAM memory capacities and increases system scalability
MRH-S (SDRAM based repeater hub) Supports PC100 for high memory capacity using SDRAM
Dual RDRAM channels Maximum memory performance (3.2 GB/s)
Prefetch Cache Maximizes system concurrency so that simultaneous processes do not impact system performance
IntelR Random Number Generator (RNG) Enables ISVs to strengthen security products
Two USB ports Plug and Play
Product Package
82840 Memory Controller Hub (MCH) 544 Ball Grid Array (BGA)
82803 Memory Repeater Hub - RDRAM (MRH-R) 324 Ball Grid Array (BGA)
82804 Memory Repeater Hub - SDRAM (MRH-S) 241 Ball Grid Array (BGA)
82806 64-bit PCI Controller (P64H) 241 Ball Grid Array (BGA)
82801 Integrated Controller Hub (ICH) 241 Ball Grid Array (BGA)
82802 Firmware Hub (FWH) 32 Pin PLCC or 40 Pin TSOP
IntelR 840 Chipset Technical Documentation
Type Title
Datasheets IntelR 840 Chipset: 82840 Memory Controller Hub (MCH) Datasheet
IntelR 82806AA PCI 64 Hub (P64H) Datasheet
IntelR 82804AA Memory Repeater Hub for SDRAM (MRH-S) Datasheet
Design Guides IntelR 840 Chipset Platform Design Guide
Support
Type Title
Product Support Product Support
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