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
Does RAM speed matter for gaming on AMD Ryzen? Testing memory up to 4000MHz | Eurogamer.net
Ryzen 3000 Memory Benchmark & Best RAM for Ryzen (fClock, uClock, & mClock) | GamersNexus - Gaming PC Builds & Hardware Benchmarks