AMD Ryzen 7000 DDR5 memory 'sweet spot' is 6000 MT/s, Infinity Fabric frequency up to 3 GHz - VideoCardz.com
Some memory speed benchmarks with a Ryzen 1700 @ 4.0GHz and a 1080 Ti, 2666 Auto vs 3200C14 vs 3466C14 tweaking sub-timings. Timings and settings used in the comments. : r/Amd
Ryzen 5 3600 Tested With Different RAM Speeds - YouTube