What exactly does the spec “PCIe x16 slot ” mean?

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Here's the best way I've found and seen of modifying a PCIE x1 slot to fit a full-sized x16 card

In ASUS 「PCIe x16 Slots - 1」 No riser cables The card is plugged straight into top PCI-E x16 slot with 2x8pin cables coming out of it 0

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