Gigabyte GA-8I945GMF-RH User Manual page 34

Memory
The category is display-only which is determined by POST (Power On Self Test) of the BIOS.
Base Memory
The POST of the BIOS will determine the amount of base (or conventional) memory installed
in the system.
The value of the base memory is typically 512K for systems with 512K memory installed on
the motherboard, or 640K for systems with 640K or more memory installed on the motherboard.
Extended Memory
The BIOS determines how much extended memory is present during the POST.
This is the amount of memory located above 1 MB in the CPU's memory address map.
GA-8I945GMF-RH Motherboard - 34 -