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

PCIe lanes understanding pcie 3 0 x4 slot Typically Yes, assuming the PCIe was running at the highest speed possible on Gen3, which was 8GBs per lane The card will pcie gen 4 in gen 3 slot I do have some doubts though on power draw requirements over x4 PCIe since A2000 doesn't

pcie 4 gpu in pcie 3 slot PCIe x1 slots are often used for less demanding expansion cards, such as sound cards, network cards, and Wi-Fi adapters PCIe x4: This slot has four lanes for