ASROCK B660M-HDVP/D5 Mode D'emploi page 21

2.4 Expansion Slots (PCI and PCIe Slots)
There are 1 PCI slot and 3 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.
PCI slots:
The PCI1 slot is used to install expansion card that have 32-bit PCI interface.
PCIe slots:
PCIE1 (PCIe 4.0 x16 slot) is used for PCIe x16 lane width graphics cards.
PCIE2 (PCIe 3.0 x1 slot) is used for PCIe x1 lane width cards.
PCIE3 (PCIe 3.0 x1 slot) is used for PCIe x1 lane width cards.
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