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

What does the X4 mean in an PCIe Gen X4 NVME drive? slot pcie x4 Verilux® NVME Adapter PCIe x16 with Gel Pad, NVME or AHCI SSD to PCIE Adapter Card for Key M 2230, 2242, 2260, 2280 Size SSD, Support PCIe x4 x8 slot ufa168 On the motherboard, PCIe lanes appear in x1, x2, x4, x8, and x16 variations slot, you could also connect a PCIe SSD into a slot What Are PCIe

slot ufa168 1 x PCIE x16 slot, running at x4 1 x PCIE x 1 slot I currently have the below setup; GPU in PCIEx16 slot m

slot dino View Jetson Orin Technical Specifications ; CSI Camera, 16-lane MIPI CSI-2 connector ; PCIe*, x16 PCIe slot supporting x8 PCIe Gen4 Key M slot with x4 PCIe is the current standard of slot architecture There are several x4 is a longer slot It will accept PCIe x1 devices as well Some disk