Intel® 845GE/PE Chipset
Datasheet: Intel® 82845GE Graphics and Memory Controller Hub (GMCH) and Intel® 82845PE Memory Controller Hub (MCH)
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.The difference between the 82845GE GMCH and 82845PE MCH is that the 82845GE contains an internal graphics device and the 82845PE does not contain an internal graphics device.Note: Unless otherwise specified, the information in this document applies to both the 82845GE GMCH and 82845PE MCH. The term (G)MCH refers to both the 82845GE GMCH and 82845PE MCH.Intel® 845GE / 845PE Chipset System OverviewFigure 1-1 shows an example block diagram of an 845GE/845PE chipset-based platform. The 845GE/845PE chipsets are designed for use in a desktop system based on an Intel® Pentium® 4 processor in a 478-pin package. The 845GE/845PE chipsets support the Pentium 4 processor with 256-KB L2 cache and the Pentium 4 processor with 512-KB L2 cache on 0.13 micron process. The processor interface supports the Pentium 4 processor subset of the Extended Mode of the Scalable Bus Protocol. In an 845GE/845PE chipset-based platform, I/O functions are integrated onto the ICH4.The 845GE chipset platform supports either an integrated graphics device (IGD) or an external graphics device on AGP. The IGD has 3D, 2D, and video capabilities. The IGD also has two multiplexed Intel DVO ports to support DVO devices. The GMCH’s AGP interface supports 1X/ 2X/4X AGP data transfers and 2X/4X AGP Fast Writes, as defined in the Accelerated Graphics Port Interface Specification, Revision 2.0 for 1.5 V signaling.The 845PE chipset platform does not contain an integrated graphics device. Graphics is supported with an external graphics device on AGP. The AGP interface has the same characteristics as the 845GE chipset.The 845GE/845PE chipset platforms support 2 GB of system memory. The memory can be either 266/333 MHz Double Data Rate (DDR) memory components with a 64-bit wide data bus. Available bandwidth is 2.7 GB/s using DDR333.
Read the full Intel® 845GE/PE Chipset Datasheet.