ASROCK J3455 PRO BTC+, Manual

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10
2.2 Expansion Slots (PCI Express Slots and Mining Ports)
There are 8 PCI Express slots and 3 Mining ports on the motherboard.
PCIe slots:
PCIE1/PCIE2/PCIE3/PCIE4/PCIE5/PCIE6/PCIE7/PCIE8 (PCIe x16 slot) is used
for PCI Express x1 lane width cards.
Mining Ports:
M_Port1/M_Port2/M_Port3 is used for riser kits (at x1 mode).
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.
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.