I didnt solve the xmp issue, I figured out how to downgrade the bios to the previous versioin.  If you need help downgrading your bios do a search on youtube.  once i downgraded the bios to 1.1.2 from 1.1.4 the xmp was working again.
I have a stock Alienware Aurora R12 Windows 10 Home, 11th Gen Intel 19-11900KF @ 3.50GHZ, NVIDIA GeForce RTX 3090, 32GB factory installed memory, 1TB SSD, 1TB HHD, migrated 480GB SSD with my Origin directory. So I was off the gaming PC for a few days, and booted up last night (07.20.21) to a BSOD shortly after logging into Windows. Oh no, is it the extreme humidity? Was it the heat unseating something? So obviously I'd love any suggestions on my next move. My RAM is now running at 2660 instead of the previous value FROM THE FACTORY of  "370-AGKI : 32GB Dual Channel DDR4 XMP at 3200MHz" Question: Do I downgrade my BIOS? Or suffer in silence with my still blazing fast rig until I get to beta test the next bios? Final Question: How can I let DELL know the latest BIOS update BORKED my FACTORY computer? Thank you. First time pre-built gaming PC buyer, but for supply chain issues I did it, needed to have the best.
Aurora R12, BSOD after BIOS update