ASRock X299M Extreme4 User Manual - Page 24
Expansion Slots (PCI Express Slots), PCIe Slot Configurations For CPU with 44 PCIe lanes
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2.4 Expansion Slots (PCI Express Slots) There are 3 PCI Express slots on the motherboard. Before installing an expansion card, please make sure that the power supply is switched off or the power cord is unplugged. Please read the documentation of the expansion card and make necessary hardware settings for the card before you start the installation. PCIe slots: PCIE1 (PCIe 3.0 x16 slot) is used for PCI Express x16 lane width graphics cards. PCIE2 (PCIe 3.0 x16 slot) is used for PCI Express x16 lane width graphics cards. PCIE3 (PCIe 3.0 x16 slot) is used for PCI Express x4 lane width graphics cards. * If you install CPU with 44 lanes, PCIE1/PCIE2/PCIE3 will run at x16/x16/x4. * If you install CPU with 28 lanes, PCIE1/PCIE2/PCIE3 will run at x16/x8/x4. * If you install CPU with 16 lanes, PCIE1/PCIE2/PCIE3 will run at x16/x0/x4 or x8/ x8/x4. PCIe Slot Configurations (For CPU with 44 PCIe lanes) PCIE1 PCIE2 PCIE3 Single Graphics Card x16 N/A N/A Two Graphics Cards in CrossFireXTM or SLITM Mode x16 x16 N/A English 18
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