Is it okay to put Gen 3 SSD in my motherboards Gen 4 pcie slots?

can you put a gen 4 ssd in a gen 3 slot
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3 drives use the same 12+16 Pin connector and all share a PCIe x2 interface, except for the 1TB Gen 3B SSD which has a PCIe x4

The card physically has an X4 interface, so it could be plugged into an X4, X8, or X16 slot It can still physically only access 4 lanes 2 slots I'm looking to add 2 pcie gen 4 nvme SSDs I assume one drive will use one of the x16 lanes And the graphics card

can nvme be used in m.2 slot Can I insert a SATA drive into the PS5 console? No SATA SSDs aren't supported Should I remove the SSD if I send my PS5 console for repair Well yeah but if you put this card in an 8x slot then only two of the SSD's would work Wouldn't it just fall back to PCIe 3 speeds?