ATI Technologies RADEON X1550 SERIES - Manual (Page 24)

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Note: If you use multiple monitors, the Radeon® X1550 Series card
must be the primary graphics card. Normally, the system BIOS
determines which graphics card will be the primary.
To connect your monitors
1 Power off your computer and monitors.
2 Plug the monitor cables into their appropriate connectors.
Connections and Adapters for the Radeon® X1550 Series Card
1 Standard VGA Monitor Connector. To connect a VGA monitor to
the DVI-I connector, plug the supplied DVI-I-to-VGA adapter into
the DVI-I connector, then plug your monitor cable into the
adapter.
2 DVI-I-to-VGA Adapter (optional, not included).
3 DVI-I Connection. To connect a digital display.