why xp shows memory descrepancy at 2 gigs or more

Discussion in 'Windows Desktop Systems' started by Perris Calderon, Aug 5, 2005.

  1. Perris Calderon

    Perris Calderon Moderator Staff Member Political User

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    new york
    pretty good pdf, not entirely accurate, but a great explanation why there's a "memory hole"...here's a snippet

    This problem occurs for 2 reasons, which are legacy 32-bit compatibility and the resource conflict caused by maintaining legacy 32-bit compatibility. Since the system BIOS does not know what operating system will be booted it must setup the system in 32-bit mode. This means that memory and all device address spaces must be mapped below 4GB. When 4GB of memory is installed in the machine there is a resource conflict between the physical memory and the device address space....
     

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  2. Shamus MacNoob

    Shamus MacNoob Moderator Political User

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    Location:
    L'Ile Perrot Quebec
    Good read !