I recently upgraded my video card to a Sapphire HD 5770. The good news is that I can turn up the graphic quality and still have a decent framerate. The bad news is that I am having boot difficulties, although I can still start Windows.
There is also a strange video glitch when I try to get on the boat from Limsa Lominsa. When the boat is docked, it is parallel to the ramp instead perpendicular, and the boarding animation is glitched. No problem boarding the boat at the other end of the route.