ASROCK Taichi B550, User Manual

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2.4 Expansion Slots (PCI Express Slots)
There are 5 PCI Express slots on the motherboard.
PCIe slots:
PCIE1 (PCIe 4.0 x16 slot) is used for PCI Express x16 lane width graphics cards.
PCIE2 (PCIe 3.0 x1 slot) is used for PCI Express x1 lane width cards.
PCIE3 (PCIe 4.0 x16 slot) is used for PCI Express x8 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 x4 lane width graphics cards.
* If PCIE2 or PCIE4 is occupied, PCIE5 will downgrade to x2 mode.
PCIe Slot Configurations
Ryzen series CPUs (Matisse):
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 PCIE5
Single Graphics Card Gen4x16 N/A N/A
Two Graphics Cards in
CrossFireX
TM
Mode
Gen4x8 Gen4x8 N/A
Three Graphics Cards in
3-Way CrossFireX TM Mode
Gen4x8 Gen4x8 Gen3x4