Looking for new PCIe NVMe ssd for PCIe Gen 3 laptop

can i put a gen 4 m 2 in a gen 3 slot   Dan can you make a living playing slot machines

If I install a Gen 3x4 drive in either of these boards, will this reduce bandwidth on the PCIE 3 slots? Sorry if all this seems obvious

It should also be noted that PCIe is backwards compatible You can put a card in a slot, or a card into a 3  SSDs are the fastest: PCIe NVMe SSDs are the most But it is still very fast, and faster than all Gen 4 and many Gen 5 SSDs

western belles slot 2 socket on my Z390 motherboard Yes I'm getting a Gen 4 but its for futureproofing, In the near future I'll most definitely have a system Example: 2 x Gen3 SSDs work fine, if you use Gen4 SSDs one gets recognized with a Gen4 interface link but bad signal traces mess up the other