Can You Use a PCIe 4.0 SSD On Your Existing Motherboard?
You can use the PCIe 4.0 SSD on any motherboard with an NVMe M.2 slot.
How to Transfer Data from One NVMe SSD to Another Without Losing ...
as far as available PCIe slots on the motherboard (x1, x4 etc Gen3/Gen4) that is irrelevant, since 99% of AM4 motherboards come with 1, 2 or even more M.2 ...
Dissecting the Modern Motherboard
And since you may be confused about the M.2 slots on your computer’s motherboard, we have already explained everything regarding the same up above.