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How to know when to use the /PAE switch

Hi,
I have a Windows server running Server 2003 Enterprise Edition SP2 with only 4gb of memory, I have just bought another 28GB of RAM to put the server to 32GB.
Question is if i install the RAM, will my Dell Poweredge server 2900 auto pick this up or do I have to use the /PAE swith also I have 2 other servers running Server 2003 Standard x64 Edition SP2 and the same question applies to them
cheers

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Techno-Man-uk
Asked:
Techno-Man-uk
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2 Solutions
 
Brian PiercePhotographerCommented:
You must use the /PAE switch if you install more than 4Gb RAM if you want windows to see it.

the /PAE switch is only applicable to Enterprise Edition - Standard Edition is limited to 4Gb - no switch will make any difference
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Techno-Man-ukAuthor Commented:
I thought Standard Edition x64 would support over 64GB of RAM?
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oBdACommented:
If the memory isn't hot-swappable, you'll need to add the /pae entry to your boot.ini of the 32bit version; otherwise the PAE kernel is used by default.
The Server 2003 Standard x64 supports up to 32GB RAM without any changes.
Overview of Windows Server 2003 R2 Standard x64 Edition
http://www.microsoft.com/windowsserver2003/64bit/x64/standard.mspx
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Techno-Man-ukAuthor Commented:
Great, one more stupid question how do i know if my memory is hot swappable?
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Brian PiercePhotographerCommented:
... opps - yes i missed the fact it was the x64 standard version - no chnage required on this.
my comment about the 32bit version is good...
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Techno-Man-ukAuthor Commented:
here is my current PAE switch

[boot loader]
timeout=30
default=multi(0)disk(0)rdisk(0)partition(2)\WINDOWS
[operating systems]
multi(0)disk(0)rdisk(0)partition(2)\WINDOWS="Windows Server 2003, Enterprise" /fastdetect /NoExecute=OptIn

do i just add /PAE to the end like so

[boot loader]
timeout=30
default=multi(0)disk(0)rdisk(0)partition(2)\WINDOWS
[operating systems]
multi(0)disk(0)rdisk(0)partition(2)\WINDOWS="Windows Server 2003, Enterprise" /fastdetect /NoExecute=OptIn /PAE
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Brian PiercePhotographerCommented:
yep..
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