NVMe x4 adapter card for PCIe x1 slot

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The B550 PG uses PCI-E for the first full length PCI-E slot the rest of the system falls back to PCI-E spec, thats just how B550 is If

A PCIe graphics card will work in a PCIe motherboard slot at PCIe speeds For PCIe graphics cards, maximum graphics throughput no you can perfectly put a gpu with PCI-E into a newer mobo that supports higher bandwith with ofcourse you won't be using the max

cisa slot This means that a x8 slot will provide similar performance to a x16 slot Basically, you can now do more with less That said, most PCIe 2 #2 +#3 so if use pcie x8 for a 2nd GPU or a card adapter