ASROCK X370M Mode D'emploi page 25

2.4 Expansion Slots (PCIe Slots)
There are 2 PCIe 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 PCIe x1 lane width cards
PCIE2 (PCIe 3.0 x16 slot) is used for PCIe x16 lane width graphics cards.
PCIe Slot Configurations
Ryzen series CPUs (Vermeer)
Ryzen series CPUs (Matisse)
Ryzen series APUs (Renoir)
Ryzen series CPUs (Pinnacle Ridge)
Ryzen series CPUs (Summit Ridge)
Ryzen series CPUs (Picasso)
Ryzen series CPUs (Raven Ridge)
Athlon 2xxGE series APU
For a better thermal environment, please connect a chassis fan to the motherboard's
chassis fan connector (CHA_FAN1 or CHA_FAN2 ) when using multiple graphics cards.
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CPU PCIE2
x16
x16
x16
x16
x16
x8
x8
x4