Here is what I have with a 750 XGL connected to two CRT's
Option "TwinView" "true"
Option "TwinViewOrientation" "LeftOf"
Option "SecondMonitorHorizSync" "30.0 - 78.0"
Option "SecondMonitorVertRefresh" "50 - 130"
Option "MetaModes" "1280x1024, 1280x1024"
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