Windows Server - Windows Server 2008 64-bit Only 3.75Gb RAM Usable
Asked By Charles on 27-Jul-10 07:37 AM
Hopefully a quick question: I am running Windows Server 2008 R2 Enterprise
64-bit on a Dell PowerEdge server. I have 4Gb RAM installed in matched pairs
(2 x 2 x 1Gb). The BIOS is happy that I have 4Gb RAM installed, and the
Windows Memory Diagnostic tool is happy too.
The problem is that Windows reports 4.00 Gb (3.75 Gb usable). So my question
is: where has the rest gone? Why is not all 4 Gb usable?
Carsten Krueger replied to Charles on 27-Jul-10 06:23 PM
Am Tue, 27 Jul 2010 12:37:18 +0100 schrieb Charles:
Your bios must support memory remapping.
PCI extensions use the adresse from 3.75 GB to 4.00 GB and you can only use
the RAM in the space if it is mapped beyond 4.00 GB.
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Charles replied to Carsten Krueger on 28-Jul-10 03:53 AM
Thanks for the reply. I do not recall seeing anything about remapping on the
BIOS setup page but I will double-check. I know that the server can only take
up to 4Gb RAM, so perhaps that means I will not be able to remap above that
Brian Cryer replied to Charles on 30-Jul-10 07:55 AM
Some graphics cards use system RAM, so is it possible your graphics card has
grabbed the missing memory?