Well, your processor is not the issue, if you want to get GTA V on more than 60 fps with everything maxed.
GTX970 is the main issue, if you aim GTA V above 100 fps with everything maxed, I would consider getting a GTX980Ti.
If you want to keep the GTX970, just lower down some setting to get as high as fps you can get or simply live with the 50-80 fps with all maxed out.