ASROCK X99 Extreme3 Mode D'emploi page 19

2.4 Expansion Slots (PCI Express Slots)
here are 4 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 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 x16 lane width graphics cards.
PCIE4 (PCIe 2.0 x16 slot) is used for PCI Express x4 lane width graphics cards.
PCIe Slot Conigurations (For CPU with 40 PCIe lanes)
Single Graphics Card
Two Graphics Cards in
TM
CrossFireX or SLI
Mode
hree Graphics Cards in
TM
3-Way CrossFireX Mode
PCIE1 PCIE3
x16 N/A
TM
x16 x16
x16 x16
X99 Extreme3
PCIE4
N/A
N/A
x4
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