Can PCIe x4 fit in a PCIe x16 slot?

pcie x4 in x16 slot
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B550M DS3H ACAMD B550 Ultra Durable Motherboard with Pure Digital VRM Solution, PCIe x16 XPG GAMMIX S50 CORE PCIe Gen4 x4 2280 Solid State Drive –

Yes any pcie xanything card will work in a x16 slot, i have a pcie x1 asus xonar stx in a 16x slot right now x4 and x8 cards will also work in

pcie 4 in pcie 3 slot ssd When I plug a GPU in the x4 slot, it runs at x1 Here's what I tried:

pcie 50 slot PCIe x4 speed vs x8 speed vs x16 speed Tested with rtx 3060 ti