ASRock FM2A78M Pro4 Quick Installation Guide - Page 21
English, Expansion Slots PCI and PCI Express Slots
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2.4 Expansion Slots (PCI and PCI Express Slots) There is 1 PCI slot and 3 PCI Express slots on this 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. PCI Slots: PCI slots are used to install expansion cards that have the 32-bit PCI interface. PCIE Slots: PCIE1 (PCIe 3.0 x16 slot) is used for PCI Express x16 lane width graphics cards. PCIE2 (PCIe 2.0 x1 slot) is used for PCI Express cards with x1 lane width cards. PCIE3 (PCIe 2.0 x16 slot) is used for PCI Express x4 lane width graphics cards. PCIe Slot Configurations Single Graphics Card PCIE1 x16 PCIE3 N/A Two Graphics Cards in CrossFireXTM Mode x16 x4 For a better thermal environment, please connect a chassis fan to the motherboard's chassis fan connector (CHA_FAN1) when using multiple graphics cards. English 21 ASRock FM2A78M Pro4+ Motherboard