Nvidia showcased their RTX Technology and also gave us a glance at the Shadow of The Tomb Raider. There was a heavy focus on Real-time ray tracing which should make the lightning effect much more realistic and a better-looking anti-aliasing. Also, it was interesting to know that Nvidia has actually worked with game developers to add ray tracing into upcoming games and soon it will add patches to the existing games. So basically many upcoming games will be partnered with Nvidia to bring out the effect of RTX.
The main highlight was to bring out shadows in the game and maybe that's why Nvidia chose "Shadow of the Tomb Raider" to present their new technology. The title of the game suited to their new technology.
Shadow Of The Tomb Raider was shown running on the new graphics card. The game was though not able to run at 60 FPS with RTX on. The Nvidia RTX 2080 Ti is supposed to be the top of the line graphics card that is expected to run any game thrown towards it, failing to see that happen is a sheer disappointment.
Though there weren’t any distinct area lights like we saw on-stage of Tomb Raider demo, it was using a single light source – the sun – and used that to create all the ray traced shadowing of the game world.
So basically to achieve something you have to sacrifice something, i.e to get a better visual experience, you have to sacrifice FPS.
So to conclude, even the world's most powerful and expensive GPU embedded with the most advanced technology is unable to bring out the best FPS possible. Maybe later with updates and patches, it will improve.