Processors
Server
FAQ for Intel® Extended Memory 64 Technology (Intel® EM64T)

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
4 GB address space 64-bit flat virtual address space
GPRs are 32-bit GPRs are 64-bit

Q. Which processors support Intel Extended Memory 64 Technology?
A. Since Q4 of 2006, Intel® EM64T has been supported in all mobile, desktop and server processors that are based on the Intel® Core™ Microarchitecture.

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

This applies to:

Intel® Xeon® Processor
Intel® Xeon® Processor E3-1200 Product Family
Intel® Xeon® Processor E5-1400 Product Family
Intel® Xeon® Processor E5-1600 Product Family
Intel® Xeon® Processor E5-2400 Product Family
Intel® Xeon® Processor E5-4600 Product Family
Intel® Xeon® Processor E7-2800 Product Family
Intel® Xeon® Processor E7-4800 Product Family
Intel® Xeon® Processor E7-8800 Product Family

Solution ID: CS-012580
Last Modified: 14-Jul-2015
Date Created: 22-Jun-2004
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