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

For example, the PCIe Samsung 990 Pro is our current choice for the best SSD overall, and the best SSD for gaming This drive is rated for

x4 NVMe SSDs directly use PCIe bus protocol, and so can be directly plugged into a full-size PCIe slot using a simple passive adapter But there

nvme pcie 40 in 30 slot NVMe drives are so much faster than SATA drives PCIe — the PCI Express standard current generation — has a maximum speed transfer of 985

nvme slot types For example, the PCIe Samsung 990 Pro is our current choice for the best SSD overall, and the best SSD for gaming This drive is rated for