Server can't identify all the memory installed

Hello,

We have a Dell PowerEdge R420 which had 32 GB of Ram installed.
We have increase the ammount of Ram to 64GB but when cheking in the system information it states that only 32GB is usable.
How do we increase the capacity the server can use?

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wcgplcAsked:
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Jeff LeggIT ManagerCommented:
Hi, So a few things I would check right off the bat. In BIOS, do you have Mirrored Channel Mode, it is a type of redundancy for the RAM.
Honestly, I would be surprised if this was it, so are these OEM memory? Did you upgrade the memory? Are there any memory related error messages when you boot up?
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Dr. KlahnPrincipal Software EngineerCommented:
What does the user manual for the server state is the maximum amount of memory that can be installed?
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ste5anSenior DeveloperCommented:
Well, like you're on a limited Windows version.

See Memory Limits for Windows and Windows Server Releases.
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Jeff LeggIT ManagerCommented:
Also, what version Windows Server are you running?
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wcgplcAuthor Commented:
It's windows server 2008 R2 standard memory limitation.
we will consider upgrading the OS
thank you very much.
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Philip ElderTechnical Architect - HA/Compute/StorageCommented:
There's a switch that can be set up in Boot.INI to enable the extra memory. /PAE though I don't remember off the top.
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David Johnson, CD, MVPOwnerCommented:
did you add 16GB of ram in each processors' memory slots or did you stick the ram in one cpu's slots?
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