ASRock Z87E-ITX - Manual (Page 26)

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2.4 Expansion Slots (PCI and PCI Express Slots)
There is 1 PCI Express slot, 1 mini-PCI Express slot, and 1 mSATA/mini-PCI
Express slot on this motherboard.
PCIe slots:
PCIE1 (PCIe 3.0 x16 slot) is used for PCI Express x16 lane width graphics cards.
MINI_PCIE1 (mini-PCIe slot) is used for WiFi module.
MINI_PCIE2 (mSATA/mini-PCIe slot) is used for mSATA or mini-PCIe module.
*** The mSATA/mini-PCIe slot is shared with SATA3_4 connector.
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.