Windows Server 2008 64-bit Only 3.75Gb RAM Usable

Discussion in 'Windows Server' started by Charles, Jul 27, 2010.

  1. Charles

    Charles Guest

    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 isn't all 4 Gb usable?


    Charles, Jul 27, 2010
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  2. 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's mapped beyond 4.00 GB.

    Carsten Krueger, Jul 27, 2010
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  3. Charles

    Charles Guest

    Hi Carsten

    Thanks for the reply. I don't recall seeing anything about remapping on the
    BIOS setup page but I'll double-check. I know that the server can only take
    up to 4Gb RAM, so perhaps that means I won't be able to remap above that

    Charles, Jul 28, 2010
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