ASRock X299 Killer SLI/ac Quick Installation Guide - Page 22
Expansion Slots PCI Express Slots
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2.4 Expansion Slots (PCI Express Slots) There are 5 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 x4 lane width graphics cards. PCIE3 (PCIe 3.0 x16 slot) is used for PCI Express x16 lane width graphics cards. PCIE4 (PCIe 3.0 x1 slot) is used for PCI Express x1 lane width cards. PCIE5 (PCIe 3.0 x16 slot) is used for PCI Express x8 lane width graphics cards. * If you install CPU with 44 lanes, PCIE1/PCIE2/PCIE3/PCIE5 will run at x16/x4/ x16/x8. * If you install CPU with 28 lanes, PCIE1/PCIE2/PCIE3/PCIE5 will run at x16/x4/ x8/x0. * If you install CPU with 16 lanes, PCIE1/PCIE2/PCIE3/PCIE5 will run at x16/x4/ x0/x0 or x8/x4/x8/x0. * If PCIE4 slot is occupied, M2_2 slot will support M.2 PCI Express module up to Gen3 x2 (16 Gb/s). PCIe Slot Configurations (For CPU with 44 PCIe lanes) Single Graphics Card PCIE1 x16 PCIE2 N/A PCIE3 N/A PCIE4 N/A PCIE5 N/A Two Graphics Cards in CrossFireXTM or SLITM Mode x16 N/A x16 N/A N/A Three Graphics Cards in 3-Way CrossFireXTM Mode x16 N/A x16 N/A x8 or 3-Way SLITM Mode English 20