Overclocking
Using the built-in scanner tool that automates overclocking, GTX 1660 Ti appears to have reasonable headroom. The final speed were an in-game 1,980MHz core speed and memory operating at 13.6Gbps. The RAM would go higher, actually, but performance remained the same.
One is looking at five-to-10 per cent extra framerate with the overclocked settings active. Power consumption jumps by 24W.