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

Kinda odd he spent nearly 4 minutes talking about the difference between Gen 3 and Gen 4 and

One way to determinate the generation of a slot where a device is attached is by its bandwidth

nvme in pcie slot Kingston A2000 NVMe PCIe SSD 1TB Preisvergleich Geizhals Deutschland ✓ Preisvergleich für Kingston A2000 NVMe PCIe SSD 1TB ✓ Bewertungen

nvme and m2 slot difference SSD PCIe vs vs , la comparativa de NVMe que necesitabas no había slot ! Poco tiempo después, se ideó el slot para