Try downloading the manual and looking at page 36.
Extreme Memory Profile (X.M.P.) (Note 2)
Allows the BIOS to read the SPD data on XMP memory module(s) to enhance memory performance when
Disabled Disables this function. (Default)
Profile1 Uses Profile 1 settings.
Profile2 (Note 2) Uses Profile 2 settings.
(Note 2) This item is present only when you install a memory module that supports this feature.