ASROCK X299 Taichi CLX Handbuch Seite 23

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 3.0 x16 slot) is used for PCI Express x16 lane width graphics cards.
PCIE2 (PCIe 3.0 x16 slot) is used for PCI Express x8 lane width graphics cards.
PCIE3 (PCIe 3.0 x16 slot) is used for PCI Express x16 lane width graphics cards.
PCIE4 (PCIe 3.0 x1 slot) is used for PCI Express x1 lane width cards.
PCIE5 (PCIe 3.0 x16 slot) is used for PCI Express x8 lane width graphics cards.
*If you install CPU with 48 lanes, PCIE1/PCIE2/PCIE3/PCIE5 will run at x16/x8/
x16/x8.
* If you install CPU with 44 lanes, PCIE1/PCIE2/PCIE3/PCIE5 will run at x16/x4/
x16/x8.
* If you install CPU with 28 lanes, PCIE1/PCIE2/PCIE3/PCIE5 will run at x16/x4/
x8/x0.
PCIe Slot Configurations (For CPU with 48 PCIe lanes)
Single Graphics Card
Two Graphics Cards in
CrossFireX TM or SLI
Mode
Three Graphics Cards in
3-Way CrossFireX TM
TM
or 3-Way SLI Mode
If a M.2 PCI Express module is installed on M2_1 or M2_2, PCIE2 will downgrade to x4 mode.
If M.2 PCI Express modules are installed on M2_1 and M2_2, PCIE2 will be disabled.
PCIE1 PCIE2
x16
TM
x16
Mode
x16
PCIE3 PCIE4
N/A N/A N/A
N/A x16 N/A
N/A x16 N/A
X299 Taichi CLX
PCIE5
N/A
N/A
x8
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