Ryzen 3000 memory controller has "half the performance" on single CCD CPUs | TechPowerUp Forums
AMD Ryzen 7 3700X tested with different RAM Speeds - YouTube
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
Question - [Ryzen 2700x & X570 GAMING X] + DDR4 3600MHz limited at 2133MHz | Tom's Hardware Forum