How do I install an expansion card?
To install an expansion card, place it in a slot and press until fully inserted. This motherboard supports one PCI Express 3.0 x16 and one PCI Express 2.0 x1 expansion slot. (Page 5)
From the official Shangzhaoyuan X99 Pr9 Lga 2011 3 Motherboard manual, page 7
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