I tried now with 6200 6600 and 6600 GT are are fine for me. Only 7xxx shows it!
FYI - The best option I ever had for DVI was :
Option "FlatPanelProperties" "Scaling = native"
Option "ExactModeTimingsDVI" "true"
Option "ModeValidation" "NoEdidDFPMaxSizeCheck, NoEdidMaxPClkCheck, NoMaxPClkCheck,
NoHorizSyncCheck, NoVertRefreshCheck, NoEdidDFPMaxSizeCheck, NoEdidModes"
I am looking for a solution that the card is NOT TALKING with the monitor at all.
This would be the best and finest option for me. But how to do?