NVIDIA GeForce RTX 4090 Founders Edition Review Roundup
https://videocardz.com/140065/nvidia-geforce-rtx-4090-founders-edition-review-roundup
One thing to keep in mind before going into averages is that even at 4k, there are a number of games where in Raster, the 4090 is CPU or Engine bottlenecked.
Dying light 2 is one of the craziest uplifts I seen in both Raster and Ray Tracing:
DLSS 3.0:
https://www.techspot.com/review/2544-nvidia-geforce-rtx-4090/
Techpowerup has a lot of benches that are CPU bottlenecked or Engine bottlenecked even at 4k Raster so it's why the uplift seems lower than it should be such as hitman 3 where there is no difference between 4k or 1440p
https://www.techpowerup.com/review/nvidia-geforce-rtx-4090-founders-edition/32.html
PC Specs: CPU: 7800X3D || GPU: Strix 4090 || RAM: 32GB DDR5 6000 || Main SSD: WD 2TB SN850