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Intel® 925X Express Chipset Memory Controller Hub (MCH) Whitepaper

Intel® E7221 Chipset Memory Controller Hub: White Paper

It is intended for a technical audience interested in learning about the E7221 chipset architecture. Please refer to the Intel® I/O Controller Hub 6 / 6R / 6W (ICH6) / (ICH6R) / (ICH6W) White Paper for complete details on the I/O hub controller.

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 EM64T Software Developer Guide at

Intel® EM64T requires a computer system with a processor, chipset, BIOS, OS, device drivers and applications enabled for Intel EM64T. 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.

The E7221 chipset supports PCI Express* and DDR/DDR2 Chipset for the Intel® Pentium® 4 processor in the LGA775 package. The E7221 chipset, with its enhanced architecture, delivers an efficient high-bandwidth communication channel connecting the processor, system memory, I/O subsystem, and other components together to deliver a stable high performance desktop or server platform solution.

Read the full Intel® E7221 Chipset Memory Controller Hub White Paper.