ASROCK Z490 Phantom Gaming-ITX/TB3 Handbuch Seite 25

2.4 Expansion Slot (PCI Express Slot)
There is 1 PCI Express slot 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 slot:
PCIE1 (PCIe 3.0 x16 slot) is used for PCI Express x16 lane width graphics cards.
* Supports PCIe riser cards to extend x16, x8/x8 or x8/x4/x4 slots
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