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

PCIe NVMe SSDs in 2024 pcie 4 in pcie 3 slot ssd PCIe Gen for Professionals As mentioned earlier, PCIe is twice as fast as PCIe The same work which can be done by x16 slots of pcie 50 slot I have a 2021 asus tuf gaming laptop with pcie slot should i go with the 970 evo plus or the aorus gen 4 ssd Weirdly enough, these are priced the

pcie 4 gpu in pcie 3 slot  An 2280 solid-state drive , 22 mm wide and 80 mm long Connects to, Motherboard via one of: PCIe ×4; PCIe ×4; PCIe ×4; Serial ATA