ASROCK P81 Pro3 Handbuch Seite 20

2.4 Expansion Slots (PCI and PCI Express Slots)
There are 3 PCI slots and 3 PCI Express slots on the motherboard.
PCI slots:
The PCI1, PCI2 and PCI3 slots are used to install expansion cards that have 32-bit
PCI interface.
PCIe slots:
PCIE1 (PCIe 2.0 x1 slot) is used for PCI Express x1 lane width graphics cards.
PCIE2 (PCIe 2.0 x16 slot) is used for PCI Express x16 lane width graphics cards.
PCIE3 (PCIe 2.0 x1 slot) is used for PCI Express x1 lane width graphics cards.
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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.
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