ASROCK H110 Pro BTC+ Manuel page 19

2.4 Expansion Slots (PCI Express Slots)
There are 13 PCI Express slots 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:
PCIE2 (PCIe 3.0 x16 slot) is used for PCI Express x16 lane width graphics cards.
PCIE1_1/PCIE1/PCIE2_1/PCIE3_1/PCIE3/PCIE4_1/PCIE4/PCIE5_1/PCIE5/
PCIE6_1/PCIE6/PCIE7_1 (PCIe 2.0 x1 slot) is used for PCI Express x1 lane width
graphics cards.
1. Please connect the SATA power connector and PCIe power connectors to the power
supply when three graphics cards are installed on this motherboard.
2. 12V power supply can only provide 1.2A current in the white PCIe slots.
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