I would upgrade it. However the current time is baaaad for gpu upgrades because me and my fellow miners have bought anything what reads gpu in the side of the box. My tip (if you want to upgrade right now) would be to buy old used 980 it somewhat goes betwean 1060 and 1070 in performance. It uses abit more power, but for gaming who cares. You get it 3-4 times cheaper than 1070 as the gpu prices have skyrocketed due bitcoin mining. Older nvidia gpus are not too good for mining because of power consumption/performance ratio so they are not to much affected by the inflation of prices.