Your power supply should be enough, I would imagine it would have the required extra power connectors for the GPU.
I have the same motherboard as you, and I have the GTX 970. Your CPU should also be enough, you may have to OC it a bit in order to make up for some lacking performance.
I do not know your case so I am not sure if it would fit. But you can probably do the math and assumptions for that on your own. The RAM is still more than enough.