CEO Jensen Huang somehow found it adequate to mention nothing about the DLSS tech that would boost the performance of the new RTX 20xx cards in his official announcement. If we are to believe Nvidia's graphs, the GTX 2080 is up to 50% faster than the GTX 1080 on its own, but the DLSS tech also adds up to 60% more fps when activate, leading to more than 100% performance gains in some cases.
https://www.notebookcheck.net/Nvidia-s-RTX-2080-is-35-to-125-faster-than-the-GTX-1080-in-4K-games-thanks-to-DLSS.324140.0.html