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 7 2700X Memory Optimization benchmarks vs Core i7-8700K
AMD Ryzen 7 2700X Review 2023 - Tech4Gamers
2nd Gen AMD Ryzen Supported RAM Speeds | Puget Systems