Foxconn P4M800P7MB Manual page 31

Memory
This is a Display-Only Category, determined by POST (Power On Self Test) of
the BIOS.
Base Memory The BIOS POST will determine the amount of base (or
conventional) memory installed in the system.
Extended Memory The BIOS determines how much extended memory
is present during the POST.
Total Memory Total memory of the system.
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Chapter 3 BIOS Description