(Alpha and Integrity servers) PHYSICAL_MEMORY specifies the
    amount of physical memory available for use. The default setting
    is -1, which equates to all memory in the system. Decreasing this
    parameter allows you to test smaller configurations of memory
    without having to remove memory boards.

    This special parameter is used by HP and is subject to change. Do
    not change this parameter unless HP recommends that you do so.

    Because of hardware configuration requirements on the AlphaServer
    ES47/ES80/GS1280 systems, HP does not recommend altering the
    setting of the system parameter PHYSICAL_MEMORY from its default
    setting of -1. Artificially reducing the amount of memory can
    produce unpredictable results on these systems.

    PHYSICAL_MEMORY is an AUTOGEN parameter.

    PHYSICALPAGES is an AUTOGEN parameter.