ASROCK A520M-ITX/ac Manual page 29

2.4 Expansion Slot (PCI Express Slot)
There is 1 PCI Express slot 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.
* AMD Ryzen series CPUs (Matisse) supports PCIe riser cards to extend x8/x8 slots
For a better thermal environment, please connect a chassis fan to the motherboard's
chassis fan connector (CHA_FAN1/WP or CHA_FAN2/WP) when using multiple
graphics cards.
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