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

Physical Installation Instructions for PCIe* NVMe* and Add-In m 2 in pcie slot 2 PCI-E SSD , such as Samsung 950 Pro or Samsung SM 951, to a PC with a PCI Express x4 expansion slot You can attach the PCI-E drive directly to the m2 sata slot slots on the motherboard will usually support both PCIe and SATA but those on add-in cards will often only support one or the other There

m2_1 slot QM2 series PCIe cards add support for NVMe SSDs to a QNAP NAS, allowing users to configure SSD caching, a caching pool, or an auto-tiering volume to