NVIDIA's top-end Turing card, the US$1400 GeForce RTX 2080 Ti, couldn't even run Ubisoft's Watch Dogs Legion at 1080p/60 FPS with ray-tracing effects turned on. This leads to speculation that users might need Ampere or Big Navi cards to properly experience ray-tracing in next-generation titles.
https://www.notebookcheck.net/NVIDIA-GeForce-RTX-2080-Ti-performs-abysmally-in-Watch-Dogs-Legion-demo-preview-locked-to-1080p-30-FPS-with-ray-tracing-enabled.481178.0.html