I'm curious why someone with a six year old dual core wants to buy a ~$380 videocard. That card will cost more than all the rest of your system is worth. All I can think of is you are new to computer gaming. I can tell you that it's possible to reap benefits from a videocard upgrade...to a point. Eventually your other components are not adequate to the task no matter what videocard you use.
You reached that point where a 1070 is concerned. If your needs are such that a 1070 is the best choice, then you need a new motherboard/CPU/ram combo , as well as likely needing a new power supply.