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

    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....

    Attached Files:

  2. Shamus MacNoob

    Shamus MacNoob Moderator Political User

    L'Ile Perrot Quebec
    Good read !