RTG Graphics Card contains a Graphics processor chip off loading work from the computer's CPU. It may also give you increased resolutions and colors.
http://amiga.resource.cx/exp/search.pl?amiga=3000&cat=rtgThe Indivision solution pretty much just allows you to use modern VGA monitors with your Amiga. The Indivision sits on top of the existing graphics chip in the Amiga converting the signals to VGA. It's actually a pretty genius solution, I really like mine. But you will be limited to the native Amiga resolutions, colors, and speed.
