First off, are you sure the video card is the problem? In my experience, Vue is pickier about the amount of RAM you have, rather than the video card.

Secondly, what ATI card are you using?

I've had Vue 3.4, 5, 6.5, 8, 9, 9.5 and 10. All I've ever used were ATI cards and I've only had 1 issue that disappeared with the next driver version. Which brings me to the next question: Have you tried updating your drivers?