3970x was stable with 256gb, now my 3990x isnt

Hey all, my trx40 aorus master was rocksolid with my gskill 256gb 3200mhz kit when I had my 3970x. With how smooth things were, I decided to upgrade to a 3990x for work. Unfortunately, after the first week, I started noticing the PC would shutdown during heavy ram intensive loads at 3200mhz. I decided to downclock to 2666mhz and the pc will no longer shutdown, however, HCI memtest will detect errors.

What’s going on?

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