I have Asus z790 Hero with latest 703 bios upgrate and Intel MeUpdate Version 18.104.22.1680 too.
Test setup is
850 watt ThermalTake ATX 3.0 PSU
128 GB Corsair RAM (4 x 32GB) CMH64GX5M2B5600C36
Windows 11 Pro
Computer works great with 5000 Mhz Ram speed. When I try to XMP 1 profile from bios with 5600 Mhz, computer stucks at bios about 1 minute and if its boot, then windows crashes.
5400 Mhz also not stable, getting random crashes. Only works great at 4800-5000 Mhz. So what should I do to get 5600 Mhz from rams?
All the best.