I have the X7900x3D as my CPU, with an Asus X670E e-gaming board. I previously had a Corsair Dominator 5600 Mhz as XMP Intel optimised RAM - and only had problems with the performance and especially with the long boot times.
For about 2 weeks I have been using this memory and everything runs super well with the new EXPO RAM…6000 Mhz.
https://www.amazon.de/dp/B0BFNBJ8J4?psc=1&ref=ppx_yo2ov_dt_b_product_details
I also deactivated the IGPU in the bios.
Maybe this will help you a bit…
I use an Asus RTX 4090 TUF as my GPU, and it runs much better with the new RAM.