As a part of its Financial Analyst Day, AMD released more details about its RDNA 2 architecture coming later this year. In addition to ray tracing and variable rate shading support, AMD says RDNA 2 will deliver 50% more performance per watt than RDNA. AMD also teased Big Navi with a photo that looks an awful lot like a red and black founder's edition card.
https://www.notebookcheck.net/RDNA-2-will-be-50-more-efficient.455487.0.html
That's a rather misleading way to put it, "50% more efficient" sounds like 50% less power for the same performance, which would be 100% more performance for the same power.