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

pcie 3 0 x4 slot   Dan pcie 8x slot

Slot 2, PCI Express x16 ; Slot 3, Slot not available on this board ; Slot 4, Slot not available on this board ; Slot 5, PCI Express x8 in a

Two types of PCIe slot on an Asus H81M-K motherboard Various slots on a computer motherboard, from top to bottom: PCI Express x4; PCI Express x16; PCI Express 2 NGFF PCIe based SSD to work in main board PCIe x4 bus slot ➤ PCI Express x4 Lane Host adapter ➤Supports PCIe , PCIe and PCIe motherboard

m.2 ssd slot (nvme pcie gen3) PCIe Brand New: Dell $ $ shipping Question PCIE x8 card into a PCIE x4 slot Im about to build a computer with a Blackmagic Design DeckLink Quad HDMI Recorder Capture