ASROCK B450M Pro4-F Manual Del Usuario página 28

2.4 Expansion Slots (PCI Express Slots)
There are 3 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 x16 slot) is used for PCI Express x4 lane width graphics cards.
PCIe Slot Configurations
Ryzen Series CPUs (Matisse)
Ryzen Series CPUs (Summit Ridge)
Ryzen Series CPUs (Pinnacle Ridge)
Ryzen Series CPUs (Picasso)
Ryzen Series CPUs (Raven Ridge)
Athlon Series CPUs
26
PCIE1 PCIE2
x1 x16
x1 x16
x1 x16
x1 x8
x1 x8
x1 x4
PCIE3
x4
x4
x4
x4
x4
x4