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

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2 specification supports NVM Express as the logical device interface for PCI Express SSDs, in addition to supporting legacy Advanced Host Controller

slot SATA is the slowest: SATA isn't as fast as an SSD But it is still very fast, and faster than all Gen 4 and many Gen 5 SSDs  PCIe SSDs are twice as fast as PCIe SSDs But next-generation PCIe SSDs will double PCIe Gen 4 speeds

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