Previous leaks were already suggesting that the RDNA3 GPUs should be more than twice as fast as the current RX 6800 XT models thanks to the multi-chip module approach, but fresh rumors now claim that the impressive raster and ray tracing performance of the RDNA3 is also enabled through a massive increase in Infinity Cache memory capacity.
https://www.notebookcheck.net/AMD-RDNA3-GPUs-rumored-to-steal-the-performance-crown-from-Nvidia-Hopper-in-mid-2022-due-to-massive-Infinity-Cache-improvements.547345.0.html
"In this sense, 1080p should be relegated to AMD's RDNA3-based APU iGPUs."
Rembrandt will be RDNA2-based, but with a huge performance boost over Cezanne it should handle 1080p well. APUs beyond Rembrandt should have better than Xbox Series S performance while using less power.
Nvidia only holds the performance crown only at the most gpu bound scenarios 4k max settings as well as in raytracing currently. Anything outside that scenario AMD actually comes on top especially at 1080p super high refresh rate monitors and 1440p.