I got the same Issue. I can only guess its because of Single Sided RAM (SSR)/Double Sided RAM(DSR). I have 2x16GB DDR5 5600MHz SSR installed and it works like a charm. If i install 2x32GB DDR5 5600MHz DSR it only works with 5200MHz. I also got my hands on one 32GB 5600MHz SSR and with that installed it works with 5600MHz as well. But i don't know where to get another SSR :/. Can find any specific RAM information on SSR/DSR 😕
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