The preferred mode is 1920z1200 74 Hz 60 kHz 154 mHz +/- h/v sync This a 24 inch LCD with fast response and 1000:1 contrast, a rather impressive beast. I have a 1024x768 LCD on the ATI 9600 second VGA port. I tried several times to set proper dual head settings with desktop->settings->display but the changes did not take effect after restarting X.