Intel® Extended Memory 64 Technology (Intel® EM64T) is a technology that enhances server and workstation platforms with 64-bit addressability and related instructions. Since the last quarter of year 2006, all mobile, desktop, and server processors based on the Intel® Core™ Microarchitecture have supported the Intel® EM64T.
The table below lists 32-bit operating system, applications, and drivers and map it to its corresponding 64-bit mode.
|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|