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When to use the /3GB or /PAE parameter in the boot.ini by a Windows 2003 Enterprise server with > 4 GB memory?

Posted on 2004-10-28
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Last Modified: 2008-01-09
When to use the /3GB or /PAE parameter in the boot.ini by a Windows 2003 Enterprise server with > 4 GB memory?

We have a HP Ml370 G3 system with 5 GB internal memory and Windows 2003 Enterprise and we must use the /PAE setting in the boot.ini to see more memory then 4 GB in the task manager.

Another HP ML 570 G2 server with 5 GB internal memory and Windows 2003 Enterprise we don't have to do anything and the memory is seen by Windows completely?

On this moment we use it only when neccesary.....
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Question by:petermolit
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    That depends on the hardware:
    ====8<----[KB283037]----
    Note: Windows Server 2003, Enterprise Edition and Windows Server 2003, Datacenter Edition automatically enable PAE only if the server is using hot-add memory devices. In this case, you do not have to use the /PAE switch on a system that is configured to use hot-add memory devices. In all other cases, you must use the /PAE switch in the Boot.ini file to take advantage of memory over 4GB.
    ====8<----[KB283037]----

    Large memory support is available in Windows 2000 and Windows Server 2003
    http://support.microsoft.com/?kbid=283037

    Intel Physical Addressing Extensions (PAE) in Windows 2000
    http://support.microsoft.com/?kbid=268363

    Available switch options for the Windows XP and the Windows Server 2003 Boot.ini files
    http://support.microsoft.com/?kbid=833721
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