Recent bios updates and chipset updates for 9800x3d have also helped with ram stuttering at boot when running Expo I (in case you’ve been doing this also)
Following since I’m having the exact same issues.Paired the board with a new 9800x3d and two 990 pro’s both kept falling off when in m.2-2 or 3. Tried with a Crucial that I had lying around to make sure it wasn’t a bad drive and had the same result. ...
