PCIe, or PCI-Express, comes in x1, x4, x8, x16, x32 speeds. The size of the expansion slot also varies depending on type used. While PCIe x32 is defined in the official standard, x16 is generally the largest you will find on the market.
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What is PCIe and how is it different from other expansion slots?
What do the x16 and x32 designations mean in PCIe?