installing Gen4 NVME on a Gen3 Motherboard

AORUS Gen4 AIC Adaptor Key Features SSD gen4 ssd 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 pg slot demo free play no deposit So i have a Asus x570 prime pro and today i was going to replace my gen 3 ssd with 2x gen 4 ones On setting the top M2 slot to forced gen 3

pepe 4d slot As far as I know both PCI-e slots and devices are backwards compatible A PCI-e nvme will work on a pci-e slot as far as I know