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VRM is the component that you need to be looking at regarding the power delivery for the CPU. There are many motherboards that combine a lower-tier chipset and a high-end VRM.

B550 was that limited initially. Even the Ryzen 9 5950X runs on B550 series motherboards today. B550 is a bit scaled down, e.g. no PCIe 4.x lines, just 3.x, but that's OK with me.

My motherboard is an ASUS ROG Strix variety with 4x32GB ECC RAM and the Ryzen 9 5950X works just fine.

The chipset doesn't deliver power. So this is wrong. It has less PCI lanes and that's about it. I don't need them so I didn't buy them :)