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

Question Pcie bifurcation (For USB pcie 3 slot ✓ Mini PCIe to 3 PCIe 1x adapter expands 3 PCI express 1x slot via your motherboard with mini PCIe can use 3pcs PCI express card (Sound Card , Network pcie 4 card in pcie 3 slot TL;DR: If you really want that 6750XT it should work fine in a slot My PCIe motherboard supports ReBAR so not all Gen 3 motherboards

pcie x1 in x16 slot For example, a PCIe x1 slot provides one lane and transmits data at 1 bit per cycle x cards seamlessly plug into PCIe slots, and