Neither ATI nor nVidia has fully supported WHQL drivers for FFXIV. I'm going to assume it might be made available soon, but I think the problem may lie with SE not submitting their final codes to those respective graphic card companies in order for them to produce a stable, quality driver release. Either that or SE's DX9 game is woefully inept for DX11 cards and that SE should hurry up with their DX11 release.