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

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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That depends on the hardware:
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.

Large memory support is available in Windows 2000 and Windows Server 2003

Intel Physical Addressing Extensions (PAE) in Windows 2000

Available switch options for the Windows XP and the Windows Server 2003 Boot.ini files

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Windows Server 2003

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