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.....
petermolitAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

oBdACommented:
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
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Windows Server 2003

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.