While some games have more powerful requirements than this GPU, the GeForce GTX 1660 is only really challenged by the most demanding games released today, but normally it is more than capable of running games with a stable frame rate at 1080p. Capable of running games with up to a DirectX 12 requirement.
With GTX 1660, you can run almost any game you will encounter in the next few years. In fact, you should be most concerned about the resolution at which you can run the game (1080p, 1440p, or 4K). In this regard, the GTX 1660 can run any game smoothly at 1080p at 60 fps (for Ultra presets), while some newer games may show a significant frame rate drop at 1440p, and cannot play at 4K resolution.