ASROCK Q1900-ITX Quick Installation Manual page 14

2.2 Expansion Slots (PCI Express Slots)
here are 2 PCI Express slots on the motherboard.
Before installing an expansion card, please make sure that the power supply is
switched of 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 cards with x1 lane width cards.
MINI_PCIE1 (Half-size mini-PCIe slot) is used for half-size mini-PCIe cards, such
as WiFi module.
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