when a card is dual dvi does that mean no CRT analog?

[BenSkywalker]

But beyond that, I still don't follow the argument as VGA is an analog signal and doesn't rightly have bits-per-anything but rather waves. I don't get the article you linked either as it talks about needing three strands of fiber for SXGA when I know there are video etenders that work well over copper eithernet cable at least up to QXGA.

I really am not sure where your confusion lies as this is extremely simple on all the points you are bringing up. The article I linked to has a full breakdown of bandwidth requirements- video over a Gbit lan is digital, LANs don't handle analog. Using Cat5 as an analog cable to extend video feeds is something you didn't bring up, however it is also covered in the article I linked to. Using that method they also make note of high frequency roll off(this is very different from vid over gigabit- vid over Cat5 is vid over Cat5).