Switching to A2/B2 worked for me.ASUS B660M-PLUS WIFI using Crucial CT8G48C40U5 8GBx2 (4800MHZ)Stuck at 4000MHZ on A1/B1, would not post using XMP I or XMP II.I noticed RAM running @ 4000MHZ only because I was looking to upgrade and checked BIOS to p...