We’ve got some bad news for anyone that was hoping to hold on to their AMD 300- or 400-Series motherboard for a little while adopting new Ryzen 3000 Zen 2 processors. Yesterday, we reported that Ryzen 3000 processor will work on X470 and B450 motherboards without any performance penalty, which was definitely good news to hear.

However,

Source: Hot Hardware – AMD Confirms PCIe 4.0 Devices Won’t Be Backward Compatible With X470, X370 Motherboards