I have a GTX960 4GB with my 6600k and I was wondering what if I buy a second one (used ones cheap as hell) for 60fps1080p gaming? Because doesn't really have too much time for gaming so I don't want to buy a 1070 but in my free time I like to play with Forza, Rainbow Six: Sige, GTA 5 etc... The goal would be smooth 60FPS on 1080p high/ultra setting. Other parts are 6600k (oc 4,6GHZ), ASrock Z170EX4, 8GB RAM. Is it reachable with this option or I should stack up some money? Thx