Hi,
I have been having multiple crashes with DX11.
Alot of time resulting in BSOD.
I was about to go crazy because I am pretty computer savy. Tested all the parts with multiple tests (24h of RAM test, 2h GPU benchmark, Hard drive tested with manufacturer software), all this on two different motherboards.
Also, FFXIV was the only software giving me this problem.
I can now say without any doubt that there are some serious bug in this software when using DX11.
I found a permanent fix and I didn't have a crash for one month now (playing daily).

Turn off anti aliasing,
Texture filtering Trilinear
anisotropic Filtering x 4

I hope it can help someone else.