AMD Ryzen 7 9700X Performance With DDR5-8000 Using Corsair Vengeance 2x16GB DDR5-8000 DIMMs
Ultimately it comes down to what workloads you are running if they are more memory bandwidth intensive. For cases like OpenFOAM CFD and Incompact3D are some meaningful improvements if going for DDR5-8000 memory.
It will be fun to continue this DDR5-8000 exploration more broadly with the Ryzen 9 9900 series that typically will see more HPC-type usage than a Ryzen 7.
For the rendering workloads they tended to favor the DDR5-6000 memory with tighter timings.