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
62.5% of the 2700x samples achieve 3533MHz memory frequency...The Stilt<< : r/Amd
AMD Ryzen 7 2700X & Ryzen 5 2600 Review Popped Up Ahead of Time | TechPowerUp
DDR4 Memory Scaling Performance with Ryzen 7 2700X on the AMD X470 Platform - Legit Reviews