Excactly Keys. And what happens then?We can easily see games taking over 4GB as well. Even 5 or higher.
The game engine thinks the 970 have 4 gigs and allocated 4 gigs to the memory. Because of the segmented ram the card will stutter and give a very bad experience. Unlike the 980 where the game engine is correct.
It seems to me you havnt quite grasped the depth of the problem here. Its a damn serious issue with DX12 and all the new thin api games in 2017.