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

Gen4 nvme on PCIe 3 slot - ROG Forum will a gen 4 ssd work in a gen 3 slot
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william hill poker shop tl;dr: The crucial P3 doesn't seem to like the lack of 4 full gen3 lanes, not sure how the nvme standard plays into that I couldn't find