According to the developer of the tool “DRAM Calculator for Ryzen” the next generation of AMD Ryzen processors will be able to use DDR4-RAM with up to 5000 MHz memory clock. Ryzen 2000 processors support a maximum of DDR4-2933 RAM.
The performance of the new processors is likely to be significantly higher than that of current AMD Ryzen 2000 CPUs, not only because of the significantly faster RAM, but also because of the 7 nm production based on the new “Zen 2” microarchitecture. In the new microarchitecture, the memory controller is no longer part of the CPU cores, but is outsourced in a separate “IO chip”. This should allow more possibilities when using high RAM frequencies.
According to Yuri “1usmus” Bubliy, there are technical documents that occupy BIOS settings up to DDR4-5000. The high clock frequency is achieved via a so-called divider mode, which sets the 5000 MHz to the DRAM frequency of 1250 MHz via ½ divider.
AMD Ryzen 3000 processors can also be used with “old” AMD4 mainboards, but the high DDR4 frequencies can only be achieved with the AMD X570 chipset. In order to take full advantage of the processors’ performance, a new motherboard is required. Memory modules that reach 5000 MHz without overclocking are currently not available on the market. The currently offered maximum for the G.Skill Trident Z Royal is DDR4-4800, so you would have to overclock it manually.