Asus X99-PRO USB 3.1 User Guide - Page 33
LANE CPU, PCI Express 3.0 operating mode, configuration, PCIe 3.0/2.0 x16_1, Single VGA/PCIe card
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40-LANE CPU VGA configuration Single VGA/ PCIe card PCI Express 3.0 operating mode PCIe 3.0/2.0 x16_1 PCIe 3.0/2.0 x16_3 PCIe 3.0/2.0 x16_4 x16 (single VGA recommended) N/A N/A Dual VGA/PCIe cards x16 Triple VGA/ PCIe cards x16 x16 N/A x16 x8* * When the M.2 x4 slot is occupied, the PCIe x16_4 slot will be disabled. 28-LANE CPU PCI Express 3.0 operating mode VGA configuration PCIe 3.0/2.0 x16_1 PCIe 3.0/2.0 x16_3 PCIe 3.0/2.0 x16_4 Single VGA/PCIe card x16 (single VGA recommended) N/A N/A Dual VGA/PCIe cards x16 x8 N/A Triple VGA/PCIe cards x16 x8 x4* • *The 3-Way SLI™ configuration is not supported when using a 28-LANE CPU. • *When the M.2 x4 slot is occupied, the PCIe x16_4 slot will be disabled. • We recommend that you provide sufficient power when running CrossFireX™ or SLI™ mode. • Connect a chassis fan to the motherboard connector labeled CHA_FAN1-4 when using multiple graphics cards for better thermal environment. Chapter 1 ASUS X99-PRO/USB 3.1 1-17
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