PCIe vs PCIe NVMe SSDs: What's the difference?

Hello all, Currently, I have a Z390 Godlike motherboard with a Samsung 970 Pro 1TB NVME SSD My current readwrite speed is 3500MB2700MB

and the SSD will show up in BIOS and can be selected Lastly, in your manual it states that one should use a

candy village slot demo SATA SSDs and SSDs that use two PCI Express lanes tend to use keys B and M to maximize compatibility, since both connectors can deliver both

cannot determine a partition for slot For example, inserting a PCIe card on a PCIe slot will give you PCIe performance NVMe SSDs connect to the motherboard using