I'm talking about with 4 sticks, not 2.

I've never gotten 4 sticks to pass training, no matter what I change. This is a well-known limitation. Some people, with newer AGESA on certain motherboards, have been able to get 4 sticks above 3600 MT/s but it's not possible for most people, and questionably stable even for those that have succeeded.

I've had no issues on my ASRock X870E Taichi from the very beginning. I'm running four 24 gig sticks at 6000 MT/s (Corsair, all bought before the crazy). I didn't realize people were having this many issues. These are on the certified lists from the manufacturer of the motherboard. Never had a problem. They've been working through multiple AGESA updates / multiple BIOS updates without a hitch.