pci express slots explained
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From the manual of the Lenovo M93p (http://content.etilize.com/User-Manual/1029184064.pdf): The motherboard has 3 PCI Express slots: a "PCI Express x16 graphics card slot" a "PCI Express x1 card slot".
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Slots: 6x PCI-Express 3.0 x16 Slots (one run at x8, three runs at x4, one run at x2), 4x PCI Express 2.0 x1 Slots.
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Pci-e Express To 2x Pci Riser | Pcie To Dual Pci Slots | Pci Express To 2 Pci Card | M.2 To Pci-e Supplier | Ngff M.2 To Pci-e X16 Slot.