Hi ,
If Epic guys could do it, it woud be great, as it would make UE more universal. However, now that we know the problem, in my opinion there are much more important things to do first (like mobile ad network integration or HTML5 easy packaging).
In our particular case we’ll finish this project with UE4.7.6
At least I hope this post is useful for other developers:
for GPUs under GTX 600 use UE4.7.6
thanks for your proactivity!