ASROCK B550 EXTREME4, Manual

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2.4 Expansion Slots (PCI Express Slots)
There are 4 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 3.0 x16 slot) is used for PCI Express x4 lane width graphics cards.
PCIE4 (PCIe 3.0 x1 slot) is used for PCI Express x1 lane width cards.
PCIe Slot Configurations
Ryzen series CPUs (Matisse):
Ryzen series APUs (Renoir):
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
Single Graphics Card Gen4x16 N/A
Two Graphics Cards in
CrossFireX
TM
Mode
Gen4x16 Gen3x4
PCIE1 PCIE3
Single Graphics Card
Gen3x16 N/A
Two Graphics Cards in
CrossFireX
TM
Mode
Gen3x16 Gen3x4
For a better thermal environment, please connect a chassis fan to the motherboard’s
chassis fan connector (CHA_FAN1/WP, CHA_FAN2/WP, CHA_FAN3/WP, CHA_
FAN4/WP or CHA_FAN5/WP) when using multiple graphics cards.