Tom's Hardware published Memory Overclocking on X399 Colfax: What RAM Speed Do You Need?
A quote from the article:
The AMD X399 chipset, which is a little over two years old now, continues to be the Red Team’s flagship enthusiast platform. Since its inception, the X399 chipset has seen and housed up to two generations of AMD Ryzen Threadripper desktop processors. As one would expect, memory support has gone through its own gradual evolution.Memory Overclocking on X399 Colfax: What RAM Speed Do You Need?
Memory support on AMD's Ryzen Threadripper processors has progressed like the Ryzen desktop chips. The first-generation Threadripper chips, codenamed Whitehaven, debuted with support for DDR4 memory modules up to 2,666 MHz. Memory support wasn't bad, but it wasn't spectacular either. On the other hand, the second-generation Threadripper parts, codenamed Colfax, arrived with support for memory speeds that escalate to 2,933 MHz, which represents a 12.5% improvement over the first-gen Threadripper processors.