The output does matter, but not what you are used to thinking of. The RAMDAC is irrelevant, and much of the filtering used on an analog out won't be used as long as the monitor in question uses a direct DVI connector. If the monitor you are using does use an analog input, then the same quality issues that effect a tubed monitor will effect the LCD, though they tend to be less "picky" in terms of signal quality and will tend to look quite a bit better with even a poor 2D card.