Upon launching Dark Souls 3 it may crash or present the appearence of white screen. It is necessary to open options.ini file to change the default resolution that can fix the issue for you.
You may to adjust your setting below 1080p as it is not ideal by but it can help to run the game.
Disable SLI seems to boot okish (its a bit tempremental but will load)
Wait for the white screen, then click the mouse to get the spinning donut of doom. Hit wait for program to respond. give it a few seconds screen might flicker and then the game loads.