ASRock A780GXE/128M Quick Installation Guide - Page 19
There is one ASRock SLI/XFire Switch Card factory-mounted on
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Step 1. Connect to the system power supply. Please connect a hard disk power connector to SLI/XFIRE Power connector on this motherboard. It is recommended to use 500-Watt power supply or greater to perform the benefit of CrossFireTM feature. Step 2. There is one ASRock SLI/XFire Switch Card factory-mounted on this motherboard. This card served as a switch between the default mode (x16) and CrossFire mode (x8 / x8). ASRock SLI/XFire Switch Card is factory-mounted with its default mode (x16) side toward the retention slot base. Step 3. To change it to CrossFire Mode, you need to reverse the direction of ASRock SLI/XFire Switch Card. Please simultaneously pull open both the retention arms that hold the card in position. The card itself will spring away from the retention slot. Take it out gently by holding its edges, and keep away from touching the connectors (Golden Fingers). Step 4. Reverse the card direction so as to have the "X8 / X8 MODE" wording side toward the retention slot base. Insert the card into the bottom of the base. English 19 ASRock A780GXE/128M Motherboard