Would you be willing to share the trouble that you are having with slightly more detail? Are you experiencing video problems, graphic errors, glitches? We may be able to help you without you having to replace any of your video cards.
I use ati. The radeon hdmi. The drivers dont come with the distro (on opensuse). But in the amd website you can find the file. It s very easy to download and to compile because it comes whith a graphic wizard. Hope helps