ASROCK X99 Taichi Handbuch Seite 22

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2.4 Expansion Slots (PCI Express Slots)
There are 5 PCI Express slots on the motherboard.
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.
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 3.0 x16 slot) is used for PCI Express x16 lane width graphics cards.
PCIE5 (PCIe 3.0 x16 slot) is used for PCI Express x8 lane width graphics cards.
PCIe Slot Configurations (For CPU with 40 PCIe lanes)
Single Graphics Card
Two Graphics Cards in
TM TM
CrossFireX or SLI
Mode
Three Graphics Cards in
3-Way CrossFireX TM Mode
or 3-Way SLI TM Mode
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PCIE1 PCIE2 PCIE3
N/A x16 N/A
N/A x16 N/A
N/A x16 N/A
PCIE4 PCIE5
N/A N/A
x16 N/A
x8 x8