You can get 10 times more frames per second with Nvidia RTX cards but you need to use very high settings to reach these numbers. 1080 Ti gets around 17000 frames per second with good settings on average. That is only 2 times more than a 1080 TI. On the other hand, 1080 Ti can reach 60 frames per second without any issues, while GTX1080 TI has to work hard to get this. So, for real-time games such as CS:GO or Dota2, where 60 FPS is necessary, you are better off with a 1080 Ti card.