Abit SI-2P+ User Manual page 39

BIOS Setup 3-5
Base Memory
This item displays the amount of base memory installed in the system. The value of
the base memory is typically 640K for system with 640K or more memory size
installed on the motherboard.
Extended Memory
This item displays the amount of extended memory detected during system boot-up.
Total Memory
This item displays the total memory available in the system.
User's Manual