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What are PCI and PCI Express slots used for? express slot The PCI Express x1 to x16 adapter accommodates low profile x2, x4, x8, x12 or x16 PCI Express cards, eliminating the cost and hassle of upgrading a PCIe card or express slot PCIE SLOTS AND CARDS A PCIe or PCI express slot is the point of connection between your PC's “peripheral components” and the motherboard

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