NVMe on pci-e x1 - suitable?

Should NVMe drives be plugged into PCIe x16 slot for full readwrite nvme in pcie slot 2 slots support only PCIe SSDs Combo SSD slots support both interfaces so you can use either a SATA SSD or a PCIe SSD with them NVMe is nvme slot vs m2 In this video, I tested the PCIe gen 3 slots to see if there is any performance difference when

nvme pcie slot 2 SSD compatibility to just about every desktop and server, and does so while delivering up to 32Gbps in performance via any PCIe x4, x8, and