ASRock X299 OC Formula User Manual - Page 29
PCIe Slot Configurations For CPU with 28 PCIe lanes, Single Graphics Card, Two Graphics Cards
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X299 OC Formula PCIe Slot Configurations (For CPU with 28 PCIe lanes) PCIE1 PCIE3 PCIE4 Single Graphics Card x16 N/A N/A PCIE5 N/A PCIE7 N/A Two Graphics Cards in CrossFireXTM or SLITM Mode x16 N/A N/A x8 N/A Three Graphics Cards in 3-Way CrossFireXTM Mode x8 or 3-Way SLITM Mode x8 N/A x8 N/A Four Graphics Cards in 4-Way CrossFireXTM Mode x8 x8 N/A x8 x4 PCIe Slot Configurations (For CPU with 16 PCIe lanes) PCIE1 PCIE3 PCIE4 Single Graphics Card x16 N/A N/A PCIE5 N/A PCIE7 N/A Two Graphics Cards in CrossFireXTM or SLITM Mode x8 N/A N/A x8 N/A Three Graphics Cards in 3-Way CrossFireXTM Mode x8 N/A N/A x8 x4 For a better thermal environment, please connect a chassis fan to the motherboard's | chassis fan connector (CHA_FAN1, CHA_FAN2 or CHA_FAN3) when using multiple graphics cards. English 23
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