Processors
Intel® Extended Memory 64 Technology (Intel® EM64T)
Intel® Extended Memory 64 Technology (Intel® EM64T) Frequently Asked Questions

Q. What is Intel® Extended Memory 64 Technology (Intel® EM64T)?

A. Intel® Extended Memory 64 Technology (Intel® EM64T) is a new technology that enhances server and workstation platforms with 64 bit addressability and related instructions.

Q. Which 32 and 64-bit modes are available, and under which conditions? Can I still run my 32-bit applications on an Intel processor utilizing Intel Extended Memory 64 Technology?

Legacy Mode Compatibility Mode 64-Bit Mode
32-bit operating system 64-bit operating system 64-bit operating system
32-bit applications 32-bit applications 64-bit applications
32-bit drivers 64-bit drivers 64-bit drivers
4GB address space 64-bit flat virtual address space
GPRs are 32-bit GPRs are 64-bit

Q. Which operating systems support Intel Extended Memory 64 Technology?

A. Intel® Extended Memory 64 Technology FAQ

Q. Which processors support Intel Extended Memory 64 Technology?

Processor Family
Intel® Xeon® Processor 3000 Sequence
Intel® Xeon® Processor 5000 Sequence
Intel® Xeon® Processor 6000 Sequence
Intel® Xeon® Processor 7000 Sequence
Intel® Xeon® Processor E3 Family
Intel® Xeon® Processor E5 Family
Intel® Xeon® Processor E7 Family

Q. Will my current 533 MHz FSB systems (e.g. Intel® Server Board SE7501WV2) support Intel® Processors with Intel Extended Memory 64 Technology?

A. No.

This applies to:

Intel® Xeon® Processor
Intel® Xeon® Processor 5000 Sequence

Solution ID: CS-012580
Last Modified: 05-Mar-2013
Date Created: 22-Jun-2004
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