It's ok !
Down to 90 Hz , and the game launch.
How to made this :
-Right clic on your desktop Open Nvidia control Pannel.
-Choose Change resolution
-Create a custom resolution
-On the frequencie rate , chose 90 Hz Maximum !
-chose your custom resolution
-Launch FFXIV with DX11 setting
Enjoy the game !
( sorry for mistake, i'm french)