Currently upgrading my pc

[FLAPPYWINGNUTZ]

I currently in the market too upgrade my PC, I was wondering I have enough money for a gtx 1080 strix, which I could put in sli with my current one, or if I should upgrade my hardrive with an m.2 ssd. I use it for gaming and play games like battlefield and gta, and recently got a 4K monitor so I want 60 god on ultra settings... is my current gtx 1080 sufficient for 4K at ultra or should I go sli, and for go upgrading my storage

 

[ak47jar3d]

The gtx 1080 would be good enough for 4k 60 frames in most games. It had to say which upgrade would be better without knowing the rest of your system.