NVMe x4 and x1 compatibility?

NVMe x4 adapter card for PCIe x1 slot can i use gen 4 nvme in gen 3 slot 2 but its for futureproofing, In the near future I'll most definitely have a system with gen 4 and the price difference between the gen 3 and cantik 77 slot 2 NVMe drive of 2280 sizing It has 4x PCIe

can casinos control slot machines There seem to be some Gen 4 x4 NVMe 2230 drives in stock at various shops So I have a pair of questions: 1) The HAT is Gen 3 and I read that Gen