From what I know newer cards work in older AGP mobos (AGP 2.0 and AGP3.0) but not every time it's kinda complicated since some X4 video cards don't work on some x4 mobos:http://www.playtool.com/pages/agpcompat/agp.html
I'm not Gamer...Thanks for the suggestions though. After learning more about the AGP bus and this mobo, I bought an ATI 9600XT w/256mb. Your links were also helpful in my knowledge quest. I was mostly seeking a DVI port for the monitor I had and figured anything was better than the 32MB NViada card it had. I found the driver and the card works, although I have no way to really judge how well. But it works fine for office apps at the native resolution of my 19" monitor.