The GTX 650ti has a max power draw of 110 watts, and the GTX 1070 Strix has a max draw of 150 watts..not a huge difference, but definitely a consideration. I do not see your PSU on Tom's PSU Tier List (http://www.tomshardware.com/forum/id-2547993/psu-tier-list.html) so it makes me think it's not that great. The other problem is that your PSU only has 1 pci-e 6pin connector, and you need 2. Because of its questionable quality, and the fact you would need to get an adapter to make it work, I wouldn't bother. Use the Tier List to help you choose a new PSU (Seasonic is commonly recommended on Tom's site). A good 650 watt unit should serve you well.