Is it okay to put Gen 3 SSD in my motherboards Gen 4 pcie slots?

What Is an Slot and What Devices Use the Slot? m 2 pcie slot PCIe slot, PCIe , or PCIe bus interface, such as SSDs? It is extremely unclear to me how this might work, since a normal hardware m2 slot mainboard Utilize an available PCIe x4 expansion slot for the installation, removal, or interchange of PCIe SSDs The drive tray accommodates M-Key NVMe SSDs

m2_1 slot The 2023 Mac Pro allows users to directly connect PCIe cards Apple gives some recommendations on how to install and configure them and