It’s true, and I’ve been saying for a long time, that using 4 memory sticks with AMD isn’t a good idea. Yesterday, I tested 4x16GB DDR5 with a Ryzen 7 7800X3D. The most stable I could achieve was 4800 with CL28 or 5000 CL32, which wasn’t what I was hoping for. At 5200, I ran into BSOD while testing in MSFS. Now, I’m using 2x32GB DDR5 6000 CL30, still unoverclocked.
It’s also true that 64GB has a positive impact on 1% low FPS.
Have you tried overclocking your RAM with Gear 1?