1. People need to stop with this bottleneck thing, what you get is diminished returns for a monster gpu with a weaker CPU, but you will ALWAYS get better fps. So the answer to your question is: it doesn't matter. Its perfectly fine for you 970.
2. your CPU is old and obsolete, it will not do very well with modern games, if you can, i'd suggest to go with i7 8700 instead of i5, nobody can tell you exactly how many FPS you'll get, but even with a still very capable GTX 970, youll be able to play most games on high @ 1080p, some others keeping a fluid 60 fps but with a few things toned down.