ASROCK Z87 Extreme4 TB4, Manual

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2.4 Expansion Slots (PCI and PCI Express Slots)
There are 2 PCI slots and 4 PCI Express slots on the motherboard.
PCI slots:
The PCI1 and PCI2 slots are used to install expansion cards that have 32-bit PCI
interface.
PCIe slots:
PCIE1 (PCIe 3.0 x16 slot) is used for PCI Express x16 lane width graphics cards.
PCIE2 (PCIe 2.0 x1 slot) is used for PCI Express x1 lane width cards.
PCIE3 (PCIe 3.0 x16 slot) is used for PCI Express x8 lane width graphics cards.
PCIE4 (PCIe 3.0 x16 slot) is used for PCI Express x4 lane width graphics cards.
PCIe Slot Configurations
For a better thermal environment, please connect a chassis fan to the motherboard’s
chassis fan connector (CHA_FAN1, CHA_FAN2 or CHA_FAN3) when using mul-
tiple graphics cards.
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.
PCIE1 PCIE3 PCIE4
Single Graphics Card x16 N/A N/A
Two Graphics Cards in
CrossFireX TM or SLI TM Mode
x8 x8 N/A
Three Graphics Cards in
3-Way CrossFireX TM Mode
x8 x4 x4