ASROCK J4125B-ITX Manual De Instrucciones página 14

2.2 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 slot:
PCIE1 (PCIe 2.0 x16 slot) is used for PCI Express x2 lane width cards.
Warning:
To ensure better graphics compability, the BIOS is set to "boot from Onboard VGA"
as default even the user install a VGA card on PCIe slot.
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