Okay, if you intend on using that power supply, you'll want to check if the gpu has a 6-pin connector. As your power supply will currently not support more than 6 pins. I know that some gtx 970's have 6 pins (like mine, gigabyte gtx 970 ITX), not sure about other gpu's, but that's something you'll want to look at.
If you get a new power supply (which I would honestly recommend), that probably won't be an issue since it will most likely have plenty of pci-e connectors.