What's the main specifications of NVMe SSD?

NVMe SSD nvme m2 slot All PCIe Generations slots and slots are backward compatible so there is no need to worry about purchasing the wrong expansion card or NVMe SSD But you nvme slot types NVMe SSD 50% slower on socket 1

nvme vs m2 slot difference How fast is an NVMe SSD? · Traditional 7200 RPM HDD: 160 MBs · SATA III SSD: 600 MBs · PCIe Gen NVMe SSD: 3500 MBs Seq Reads