You can use FSR 1 on any game. Thought if you do that it will mess up the hud, but it is possibleI wish it had been FSR 1.0 instead, since all titles supporting it works beautifully with my GTX1070 and i am not sure it can Handle FSR 2.0. But anything that helps gains performance is well appreciated.
I have that card and 2.1 works wonderfully. But if you really need 1.0 you can purchase a tool on steam called Lossless Scaling and use it with any game or app that has a windowed option. Input delay is minuscule.I wish it had been FSR 1.0 instead, since all titles supporting it works beautifully with my GTX1070 and i am not sure it can Handle FSR 2.0. But anything that helps gains performance is well appreciated.