slots on ASUS z790…has 3… all are PCIe is one “faster”?

slots on ASUS z790…has 3… all are PCIe is one “faster”? nvme pcie 4 0 in 3 0 slot i plan on getting a second but my motherboard has 1 slot and 1 slot I currently have a Kingston nv2 1tb so i was wondering nvme pcie 40 in 30 slot PCIe SSDs are twice as fast as PCIe SSDs But next-generation PCIe SSDs will double PCIe Gen 4 speeds

nvme pcie 40 in 30 slot PCIe SSDs are twice as fast as PCIe SSDs But next-generation PCIe SSDs will double PCIe Gen 4 speeds

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