Windows 2008 Standard R2 x64 Not using all memory.

I have a Windows Server 2008 R2 x64 that has 48GB of RAM installed but in the computer properties is displays the following.

"memory installed (RAM): 48.0 GB (32GB usable)"

Why would it not use all 48GB of the installed RAM.
DBBurnsINAsked:
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JohnBusiness Consultant (Owner)Commented:
Check the documentation for your server. 32GB may be the maximum allowable memory. If this is the case, that would explain the message.
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Andrew LeniartSenior EditorCommented:
Just further to John's suggestion, if the server is a no name brand, look inside the case and note the name and model number of the mainboard.  It will be written on it somewhere.

Then go to the manufacturer's website and check the mainboard model specifications. That will tell you the maximum amount of usable RAM the board supports.
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arnoldCommented:
Your issue is the version of Windows server 2008 R2 which is standard. This version max memory is 32GB.
The issue/restriction.

I'll post the ms version comparison chart in the next post.
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Andrew LeniartSenior EditorCommented:
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Hello ThereSystem AdministratorCommented:
You need to have WS2008 Datacenter or Enterprise or upgrade to WS2012 Standard or WS2016 Standard. Consider upgrading because era of Windows 10 is here and you will need to upgrade your server in close future anyway to be able to manage all Win10 workstatons via GPO etc.
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DBBurnsINAuthor Commented:
Thanks Arnold. This is a big help toward figuring out the performance issues on this server.
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