I re read and you are correct, you never stated that you play this game at 120 fps, i misunderstood. Sorry about that.
With that said, i am still correct on the fact that a 970 is not worth it at this point since there are way better deals on the market, and if you cannot afford it, you should probably wait a little bit and gather a little more money as buying very old tech is not worth it.
Second, at 4k you will not run games even at 30 fps with a 970 unless the game requires very very low resources, it’s just not possible, for one you need lots of vram, that the 970 doesn’t have, it has 3.5 gb of fast and 0.5 gb of slow vram, 3.5 is not enough for most 4k gaming, so there will be lots of stuttering, second, the power is just not enough.
I mean you can be satisfied with an average of 40 or 50 fps, but it’s not that great honestly.
You can play at 4 k on a 970, doesn’t mean you should or that you are gonna have a good experience doing so.
The only games iv’e seen running decently on 4 k with a 970 are games like rocket league, extremely low demand titles, mmos are not low demand, especially when it comes to cpu as it’s usually the bottleneck, i would expect no more than 50 fps in wow, in low density zones with 4k, or old zones.
If anything what seems strange to me is that you have a 4k monitor and only a 970.