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What is the difference between PCI Express x16 and PCI Express x1?

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What is the difference between PCI Express x16 and PCI Express x1?

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In general, one -x16 card, has 16 transmit and 16 receive pairs/lines. One -x1 card, has 1 transmit and 1 receive pair/line. Theoretically a -x16 card has to be 16 times faster than one -x1 card. PCI Express interface allows the work of a card, using the smaller number of transmit/receive pairs.

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