Zend certified PHP/Magento developer

Can reverting/resetting BIOS Settings completely erase all your xmp/memory frequency changes right?

I was just wondering if a simple “Reset To Optimized Default” can be really impactful or effective to reverting all the changes you did.

Like for example, you turned on XMP, but then you changed your mind and changed The XMP Profile/Version, Changing Memory Frequency, etc. BUT can doing a “Reset To Optimized Defaults” Be that really effective/enough for you to fully revert to the settings you had before you even fiddled with your memory frequency and xmp settings? Or would it still be able to affect your PC in some way shape or form even when you booted up into windows normally even though you loaded the BIOS settings to “Reset to Optimized Defaults.” Or you might aswell just do a CMOS Battery reset? No?