Introduction
This datasheet is for both the Intel® 82845GE Graphics and Memory Controller Hub (GMCH) and Intel® 82845PE Memory Controller Hub (MCH) components. The 82845GE GMCH is part of the Intel® 845GE chipset and the 82845PE MCH is part of the Intel® 845PE chipset. Each chipset contains two main components: GMCH (MCH) for the host bridge and I/O Controller Hub for the I/O subsystem. The GMCH (MCH) provides the processor interface, system memory interface, hub interface, and additional interfaces in an 845GE / 845PE chipset desktop platform. Both the 845GE chipset and 845PE chipset use the 82801DB ICH4 for the I/O Controller Hub.

Features
■ Host Interface Support
    — One processor in a mPGA478 package
    — Hyper-Threading Technology support
    — 400/533 MHz PSB (100/133 MHz bus clock)
    — PSB Dynamic Bus Inversion on the data bus
    — 32-bit addressing for access to 4 GB of memory space
    — 8 deep In Order Queue
    — AGTL+ On-die Termination
■ System Memory Controller
    — One 64-bit wide DDR SDRAM data channel
    — Up to 2.0 GB of 266/333 MHz DDR SDRAM
    — Bandwidth up to 2.7 GB/s (DDR333)
    — 64-Mb, 128-Mb, 256-Mb, and 512-Mb SDRAM technologies
    — Supports only x8 and x16 SDRAM devices with four banks
    — Unbuffered, unregistered 184-pin non-ECC DDR SDRAM DIMMs only
    — Two DDR DIMMs, single-sided and/or double-sided
    — Does not support double-sided x16 DDR DIMMs
    — JEDEC DDR DIMM specification configurations only
    — Opportunistic refresh
    — Up to 16, simultaneously open pages
    — SPD (Serial Presence Detect) scheme for DIMM detection
    — Suspend-to-RAM support using CKE
    — Selective Command-Per-Clock (selective CPC) accesses
■ Hub Interface
    — Supports Hub Interface 1.5
    — 266 MB/s point-to-point Hub Interface to the ICH4
    — 66 MHz base clock
    — 1.5 V operation
■ AGP Interface
    — Supports a single 1.5 V Accelerated Graphics Port Interface, Specification 2.0-compliant device
    — Supports 1X/2X/4X data transfers and 2X/4X Fast Writes
    — 32-deep AGP request queue
    — AGP signals muxed with two Intel® DVO ports: Supports ADD cards (82845GE only)
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