Installed Physical Memory & Total Physical Memory

Discussion in 'Windows Vista General Discussion' started by churin, Jun 16, 2008.

  1. churin

    churin Guest

    The System Information indicates as follows:

    Installed Physical Memory: 4.00GB
    Total Physical Memory : 2.00GB
    Available Physical Memory: 1.05GB

    What do these numbers mean? My PC hardware system has two RAM modules
    each having 2GB and they are configured for dual channel operation.

    So, I think I understand what Installed Physical Memory means. But what
    about the Total Physical Memory? Where has 2GB gone? The Available
    Physical Memory of 1.05GB appears to indicate 3GB is allocated to the
    system overhead, but is this so?
    churin, Jun 16, 2008
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  2. On an x86 Windows you will see a portion reserved by the BIOS for
    memory-mapped IO for your devices. This is commonly around 1GB (entirely
    depends on which video card you have, etc). However, if you are seeing
    exactly 2GB missing then it is likely due to a memory remapping setting in
    the BIOS. On an x64 Windows it would almost certainly be the BIOS setting.
    Colin Barnhorst, Jun 16, 2008
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