First of all, the game doesn't seem to support refresh rates over 60hz. If I select something like 144hz or 120hz the game loads the lowest possible resolution.

After I found that out and I loaded the game in 1440p60hz, everything seemed to work just fine except when I wanted to exit back to Windows the game just leaves me with a black screen that forces me to do a hard reset on my PC.

EDIT: Those of you who have the same problem as I did with the black screen at exit can temporarily fix it by making the game run in windowed mode by adding the line "Windowed 1" to the config file in the Documents\My Games\The Saboteur™\SaveGames-folder. After that you can download the "Borderless Gaming" app so you can enjoy the game almost like it was fullscreen. Hopefully this will be fixed at some point though.

My hardware:

Windows 10 AE Pro x64
i5 4690k @ stock
Gigabyte GTX 970 G1 @ stock

My monitor is an Acer Predator XB271HU so natively a 1440p144hz monitor.