What Does PCIe x16 Mean?

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It's a slot of x16 size but electrically x4 This

pcie 4 gpu in pcie 3 slot What is PCI express card? How many types of PCIe cards are there? What does PCIe x8, or PCIe x16 mean? Can I use a PCIe card in a slot

pcie x4 in x16 slot PCIe x16 is your 16-lane PCI Express slot, or at least your largestlongest PCI Express slot It is the most high-bandwidth, high-performance expansion slot