Asus P1-PH1 - Manual (Page 88)

5-30 Chapter 5: BIOS setup
Load Setup Defaults
This option allows you to load the default values for each of the
parameters on the Setup menus. When you select this option or if you
press <F5>, a confirmation window appears. Select [YES] to load the
default values. Select Exit Saving Changes or make other changes
before saving the values to the non-volatile RAM.
Discard Changes
This option allows you to discard the selections you made and restore the
previously saved values. After selecting this option, a confirmation
appears. Select [YES] to discard any changes and load the previously
saved values.