ASROCK H77M-ITX Handbuch Seite 18

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2.6 Expansion Slot (PCI Express Slot)
There is 1 PCI Express slot on this motherboard.
PCIE slots: PCIE1 (PCIE 3.0 x16 slot) is used for PCI Express x16 lane width
graphics cards.
To run the PCI Express in Gen 3 speed, please install an Ivy Bridge
CPU. If you install a Sandy Bridge CPU, the PCI Express will run only at
PCI Express Gen 2 speed.
Installing an expansion card
Step 1. 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.
Step 2. Remove the system unit cover (if your motherboard is already installed
in a chassis).
Step 3. Remove the bracket facing the slot that you intend to use. Keep the
screws for later use.
Step 4. Align the card connector with the slot and press fi rmly until the card is
completely seated on the slot.
Step 5. Fasten the card to the chassis with screws.
Step 6. Replace the system cover.
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ASRock H77M-ITX Motherboard