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Lower PCIe lane cards can fit in higher slots; a PCIe x4 card and a PCIe x8 card can fit in a PCIe x16 slot, so there is no need to buy a PCIe x16 slot M.2 to PCIe expansion card if you don’t need all 4 M.2 slots.
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PCIe slots, which connect PCIe-compatible devices, are attached to a computer's motherboard, and PCIe lanes go to and from PCIe slots to send information to a computer's CPU.
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