Asrock post code slowly counting up

[Arrrtie]

New build, never posted.

R9 7950x CPU

Asrock X670e Taichi Carrara Motherboard 

EVGA Supernova P+ 1300 PSU

G.Skill 64GB Trident Z5 RGB 6000, 2x32 RAM

Zotac RTX 3090

 

This is a new build I've slowly been working on over the last week. Finally booted it up last night, no post. GPU, RAM, fans and mobo All turn on and light up, and at first the post code displayed a 15, goes through several other post codes, then landed back on 15. It stay like that for several hours before I did a BIOS Flashback to get the most recent BIOS version that wasn't in beta. Now it displays a post code 43, but slowly counts up. It seems to stay on 52. 

 

I've tried reseating the RAM, rearranged the RAM, reinstalled the CPU, checked the cooler and switched out the mounting bracket, tried without a GPU, checked all the PSU cables, no changes. Asrock documentation suggests it's a memory of CPU issue, and I've heard about there being some issues with AM5 memory at faster speeds. Any help would be appreciated!

[Arrrtie]

Update, after restarting with only one memory module in the A1 slot, the post code is now randomly going back and forth between 54 and 55.