Ryzen 4000 and EPYC Milan will not support DDR5 because you would have to change the socket - HardwareEsfera
Ryzen 4000 Am5 Deals - deportesinc.com 1688066781
The big Ryzen 7000 Memory and OC Tuning Guide - Infinity Fabric, EXPO, Dual-Rank, Samsung and Hynix DDR5 in Practice test with Benchmarks and Recommendations | igor´sLAB
Ryzen 4000 and X670 scheduled for late 2020
AMD: Ryzen 6000 'Rembrandt' in AM5 for Desktop PCs, DDR5 Pricing Could Impact Release Date : r/hardware
AMD Ryzen 7000 DDR5 memory 'sweet spot' is 6000 MT/s, Infinity Fabric frequency up to 3 GHz - VideoCardz.com
AMD announced their Ryzen 7000 series of CPUs which comes with the new AM5 socket platform, support for DDR5 RAM, PCI-E 5.0 and their version of Intel's XMP.
DDR5-6000 Memory To Be The Sweet Spot For AMD Ryzen 7000 "Zen 4" CPUs, Will Offer 1:1 Infinity Fabric Ratio With EXPO