Hopefully a GTX 970 runs it maxed at 1080p.
I don't see why it wouldn't.
Fallout games tend to be buggy and unoptimized as forget.
easily the worst part about that engine is how when you crouch you still can't fit through small spaces
The Gamebryo and its descended successor engine is flawed enough by default and since any game that uses that engine has been had a pretty buggy release. Take Skyrim and New Vegas for example.
https://www.youtube.com/watch?v=kzvZE4BY0hY
https://www.youtube.com/watch?v=kLI8PRsomG4endurance
For some reason I'm bored with Fallout 4 now