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Intel® 925X Express Chipset Memory Configuration Guide White Paper

Intel® E7221 Chipset Memory Configuration Guide: White Paper

The Intel® E7221 chipset is Intel’s dual-channel DDR/DDR2 Memory Controller Hub with Intel® Flex Memory Technology. Intel has enhanced its memory architecture design to allow for maximum configuration flexibility while providing optimal performance when combined with DDR2-533 and an Intel® Pentium® 4 processor in the Land Grid Array 775 (LGA775) package with 800 MHz front side bus.

For great server application flexibility, the Intel® E7221 chipset is specifically designed to support Intel® Extended Memory 64 Technology (Intel® EM64T) enabling 64-bit memory addressability. Select versions of the Pentium 4 processor support Intel EM64T as an enhancement to Intel’s IA-32 architecture on server platforms. This enhancement enables the processor to execute operating systems and applications written to take advantage of Intel EM64T. Further details on the 64-bit extension architecture and programming model can be found in the Intel® Extended Memory 64 Technology Software Developer Guide at

The Intel EM64T requires a computer system with a processor, chipset, BIOS, OS, device drivers and applications enabled for Intel EM64T. The processor will not operate (including 32-bit operation) without an Intel EM64T-enabled BIOS. Performance will vary depending upon your hardware and software configurations. Intel EM64T-enabled OS, BIOS, device drivers and applications may not be available. Check with your vendor for more information.

This document details the E7221 chipset memory configurations and organization. It is intended for a technical audience interested in learning about the simplified population rules introduced by Intel Flex Memory Technology and the Intel E7221 chipset platform. This white paper will provide a brief background regarding the supported memory technologies and configurations, and then discuss the styles of memory organization and modes of operation.

Read the full Intel® E7221 Chipset Memory Configuration Guide White Paper.

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