As we said above, the Steam page does reveal the Ghost of Tsushima system requirements, but with further digging we found a full list on the PlayStation blog which gives us a clearer picture of performance targets from 720p up to 4K. So, sticking with 1080p to represent most users, we can see that game recommends either a GeForce RTX 2060 or Radeon RX 5600 XT, this jumps up to the RTX 3070 and RX 6800 when playing at 1440p.
So, the game isn't exactly the easiest to run smoothly (60 FPS being the benchmark) once going above 1080p, but that's to be expected. In the grand scheme of things, it's not too bad - you can run Ghost of Tsushima with a wide variety of hardware and that's reflected in our selection today.