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
AMD Ryzen 9 3900X & Ryzen 7 3700X 'Zen 2' CPU Review | KitGuru- Part 7
Ryzen 7 5700x vs 3700x Benchmark [39% Faster than 2080 Ti]
Amazon.com: AMD Ryzen 7 3700X 8-Core, 16-Thread Unlocked Desktop Processor with Wraith Prism LED Cooler : Electronics