Well Digital Foundry tested and compared the RTX 2060 with the GTX 1080ti (even tested the GTX 1060 at one point in Battlefield 5) using the newly released ray tracing driver update.....
https://youtu.be/TkY-20kdXl0I must say that the Pascal based GTX 1080ti did surprisingly well if you aren't a absolute frame rate snob. Yes frame rates in the Port Royal ray tracing benchmark software for Pascal are pretty bad, but that's software that is using ray tracing way more than the current games do. In Tomb Raider, Metro and Battlefield.... the 1080ti at 1080p resolution was usually above a console standard 30fps with a some dips here and there. But in a lot of other cases it was in the 40fps-75fps range. Certainly playable enough for Pascal owners to give it a visual test drive without it being a slideshow. Better than I was expecting that's for sure.
Other than giving us a taste of ray tracing on Pascal so that we may want to upgrade to an RTX card, Digital foundry came up with another possible reason. This allows devs time to work on optimizing ray tracing for systems that lack dedicated hardware for it and thus justifying the programing effort to put it in games. That way, more users get to see it in action and Nvidia can help recoup it's R&D costs by up-selling them on the better performance that RTX offers for it.
Also.....AMD cards are pretty compute heavy for their relatively cheap price. The AMD based next-gen PlayStation and Xbox won't likely have dedicated hardware for ray tracing. Nvidia inevitably is helping them in this respect by allowing devs to tweak and test drive a software simulation based solution now, for systems in the future that don't include hardware to accelerate it. It's a win-win for all.
