Is it okay to use PCI Gen 4 drives with gen 3 slots?

In this video, I will explore how to check if your motherboard supports Gen 4 SSDs or not

➤ High-speed NVMe PCIe Gen3 x4 Interface:combine the next-gen PCIe Gen 3x4 NVMe interface with the latest V-NAND technology and a newly enhanced Phoenix

can you tell when a slot machine will hit gen 3 2 slot in your motherboard can be wired to support the PCIe interface, and you can buy adapters that allow you to slot “gumstick” M

candy dreams slot 2 X16 GEN 4 CARD for 4 Nvme but it's OK for only one slot I should change to x4x4x4x4 in my bios Another idea was to use the slot for