i'm basically in the same boat. fx5700. after trying so many different combinations over the past several weeks, i thought maybe my old tv just liked old cards as it was working fine with a geforce 2 and nvtv.
i'm hoping there is some way to get this to work as i use mythtv extensively and would have to go back to the old card otherwise. nvtv doesnt like the 5700.
anybody have any luck?