How ACE COMBAT 8: WINGS OF THEVE runs on the Radeon RX 580
Our estimate puts the Radeon RX 580 at about 17 fps on High at 1080p in ACE COMBAT 8: WINGS OF THEVE, which means it runs only on reduced settings. On Low the same card manages about 32 fps, and on Ultra about 12.
The graphics card is the limit here, so lowering the resolution or the quality preset is what raises your frame rate.
For a steady 60 fps, our estimate says: 1080p: under 60 fps at every preset, best is 32 fps on Low; 1440p: under 60 fps at every preset, best is 23 fps on Low; 4K: under 60 fps at every preset, best is 13 fps on Low.