Server is running Server 2008 R2 Enterprise x64 and only using 32 of 48 gb of installed memory. What gives? Obviously if I was running Standard edition my problem would be pretty clear, but I'm not.

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I actually figured this out myself. Turns out my Dell Poweredge was configured wrong in the BIOS. I went in and changed the Memory Operating Mode to Optimizer Mode and the Node Interleaving to Enabled. It was just an inkling I had. I now have full use of all 48 GB.
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This article is for Windows 7, but ignore the first portion where 3.5 out of 4 GB is expected behavior for W7, and look in the Things to Try section:

http://support.microsoft.com/kb/978610/en-us

 

I have also noticed several people in forums stating that they did a DSIM upgrade from standard to enterprise, and something similar happened when they relicensed using a different key after the upgrade.  They recommend trying "SLMGR / REARM" and relicensing.

http://social.technet.microsoft.com/Forums/en/windowsserver2008r2general/thread/79f0bf5c-eef0-46e1-91cc-554217c79b19

http://social.technet.microsoft.com/Forums/en-US/winserverTS/thread/6debc586-0977-4731-b418-ca1edb34fe8b

http://ss64.com/nt/slmgr.html

Answered 05/16/2012 by: philologist
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