ASROCK A520M-HDV, Manual

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2.4 Expansion Slots (PCI Express Slots)
There are 2 PCI Express slots on the motherboard.
PCIe slots:
PCIE1 (PCIe 3.0 x1 slot) is used for PCI Express x1 lane width cards.
PCIE2 (PCIe 3.0 x16 slot) is used for PCI Express x16 lane width graphics cards.
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.
For a better thermal environment, please connect a chassis fan to the motherboard’s
chassis fan connector (CHA_FAN1 or CHA_FAN2 ) when using multiple graphics cards.