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this topic  Resource and Memory Management Technologies
Updated: March 28, 2003   Resource and Memory Management
Components  4GT and PAE X86 are available only in the 32-bit
editions of Microsoft Windows Server 2003, Enterprise Edition,
or Microsoft Windows Server 2003, Datacenter Edition, of the
Windows Server 2003 family. Both technologies can provide user
applications with access to additional RAM. The default virtual
address space and flat addressing used on the 64-bit versions of
these products negates the need to use these technologies on the
64-bit platforms.  4GT makes more of the computer’s virtual
memory available to applications by making less virtual memory
available to the operating system. 4GT allows applications to
address 3 gigabytes (GB) of virtual memory instead of the 2 GB
normally allocated for user mode processes. This is a 50 percent
increase in virtual memory for the applications, allowing more
data to be cached by the ap