AMD has announced that its next-gen Ryzen 4000 CPUs based on the Zen 3 cores will be supported by X570 & B550 chipset based motherboards.
It appears that new Zen 3 architecture will only support X570/B550 boards on AM4 platform.
The X370/B450/X470 boards will not be compatible with Ryzen 4000 and effectively reaching EOL.
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The slide from AMD