Onboard m2 slot or pcie m2 expantion card? which is faster?

187 M2 Slot Images, Stock Photos, 3D objects, & Vectors pcie m 2 slot is a slot that can interface with SATA , PCI Express pcie nvme slot By specification, all PCIe cards are backwards compatible with the lowest bandwidth x1 lane slots If the x1 slot is designed with an open end,

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