ASROCK Fatal1ty Z170 Gaming K4 Series Manual page 22

2.4 Expansion Slots (PCI Express Slots)
here are 5 PCI Express slots on the motherboard.
Before installing an expansion card, please make sure that the power supply is switched of
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 x1 slot) is used for PCI Express x1 lane width cards.
PCIE2 (PCIe 3.0 x16 slot) is used for PCI Express x16 lane width graphics cards
PCIE3 (PCIe 3.0 x1 slot) is used for PCI Express x1 lane width cards.
PCIE4 (PCIe 3.0 x16 slot) is used for PCI Express x4 lane width graphics cards.
PCIE5 (PCIe 3.0 x1 slot) is used for PCI Express x1 lane width cards
For a better thermal environment, please connect a chassis fan to the motherboard's chas-
sis fan connector (CHA_FAN1, CHA_FAN2, CHA_FAN3 or CHA_FAN4) when using
multiple graphics cards.
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