Aaeon PCM-6890 User Manual page 91

If you select this option and press <ENTER>, the values entered in
the setup utility will be recorded in the chipset's CMOS memory.
The microprocessor will check this every time you turn your
system on and compare this to what it finds as it checks the
system. This record is required for the system to operate.
Chapter 3 Award BIOS Setup 79