What does the X4 mean in an PCIe Gen X4 NVME drive?

This PCIe x4 slot is “open-ended” The slot, or cut on the right-hand side of the slot enables it to accept larger PCI cards

The main difference between PCI Express and the older PCI slot is the elimination of bus or communication channel sharing PCI Express utilizes dedicated serial

pcie 20 x16 slot PCI Express slots are one of the essential technologies that exist on a motherboard PCIe slots are utilized by various performance

pcie x 16 slot PCI Express was introduced in 2002 as Third Generation IO , and by the mid-2000s, motherboards had at least one PCIe slot for graphics PCIe