I posted this in this thread as well http://forum.square-enix.com/ffxiv/t...d-and-Gridania

I also run a gt240 that had the same issue. Same thing can run other games full blast no problems. First go to the game config and set everything to standard with shadow detail set on lowest. Next turn multisampling to 2x MSAA. This has at least stopped the crashing in Black Shroud areas for a few of us that have the gt240. You may see a slight visual glitching but its easier to live with then constant crashing.

While the ultimate answer is S.E. optimizing there game I hope this band aid solution helps until then. If it does not work for you please be kind enough to post back.