Well, I would recommend that you purchase the GTX 1080 instead of the GTX 980 since it offers a significant improvement in performance. In the link below you can see overall performance of various card including both of the GPUs I mentioned at various resolutions. The closest to your monitor's resolution would be 2560x1440. The GTX 1080 represents the baseline of 100% performance the GTX 980 TI's performance comes in at 73%. That means the GTX 1080 provides 37% better overall performance based on the games they benchmarked. I recommend you look at the individual game benchmarks.
https
/www.techpowerup.com/reviews/NVIDIA/GeForce_GTX_1080/26.html
It is important to note that nVidia's recommended price for the GTX 1080 is $599 for the...