ASRock B85 Pro4 - Manual (Page 23)

B85 Pro4
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English
2.4 Expansion Slots (PCI and PCI Express Slots)
There are 2 PCI slots and 4 PCI Express slots on the motherboard.
PCI slot:
The PCI1 and PCI2 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 cards.
PCIE2 (PCIe 3.0 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 cards.
PCIE4 (PCIe 2.0 x16 slot) is used for PCI Express x4 lane width graphics cards.
PCIe Slot Configurations
4 PCIE2 PCIE4
Single Graphics Card x16 N/A
Two Graphics Cards in
CrossFireX TM Mode
x16 x4
For a better thermal environment, please connect a chassis fan to the motherboard’s chassis
fan connector (CHA_FAN1 or CHA_FAN2) when using multiple 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.