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

pci 4 in pci 3 slot   Dan pcie x4 in x16 slot

Slot genügen Rechnerisch kämen wohl gerade mal etwas über 6Gbytes über den PCI Bus, da die RTX 4060ti nur 8 PCI Lanes nutzt

PCIe Gen 3 x 1 PCI Slot x 3 30423052 B-Key x 1 (PCIe PCI Express

groovy sixties slot 4-3, per single PCI Segment Group show less , ECN, November 18, 2018 Errata for the PCI Express® Base Specification Revision , , Errata, October 31 List of Motherboards with 3 PCI-Express x16 Slots: GIGABYTE B650 Gaming X AX V2, MSI X670E Gaming Plus WiFi, ASUS ROG Strix Z790-E Gaming WiFi II,