My search for a fix to the crashing of the DX11 client on my GTX 970 and then 980 Ti after I upgraded led me first to this Reddit thread:
http://www.reddit.com/r/ffxiv/commen...ur_game_keeps/
Unfortunately at first, trying the steps did not appear to fix the crashing. This Reddit post is not very clear on what it means by disabling applications which create an overlay, so I will be absolutely clear on this point.
You cannot just disable the overlay by making it not appear over the game. You must completely exit the offending application, it cannot be running in the background at all.
I was running MSI Afterburner to overclock my video card, but I had the Rivatuner Statistics Server running in the background because I use Afterburner's recording system to record gameplay. Even when I set it to "Stealth" mode to disable detection and activation of RSS in FFXIV, it still caused crashes. I had to completely disable all gameplay functions in Afterburner, which unloaded the RSS application completely from memory, to resolve the crashes. Afterburner itself doesn't cause any problems, and neither does overclocking assuming your OC is stable in games.
I also run FRAPS to watch the framerate counter from time to time. I had to completely quit FRAPS and not even leave it running in the background to stop the FFXIV client from crashing. Just leaving FRAPS running was causing the crashing to occur, even if the framerate counter overlay is disabled.
In general, any applications which create an overlay over the game must be completely terminated, they can't be running in the background at all. The only apparent "safe" exception is Steam at the moment. I'm going to test my fixes by playing the game for a really long time tomorrow, but this seems to be the solution at least for Nvidia card owners who are having random crashing using the DX11 client. I hope this helps you guys out.
I'm using driver version 353.38 (Chrome hotfix) with FFXIV on my 980 Ti.
If you want to try this driver, download it here: http://nvidia.custhelp.com/app/answe...ail/a_id/3694/