Someone made some comparisons from AMD's numbers over on beyond3d and the 4090 was far from just 45% faster in RT. We are going to need proper reviews to have any idea how things pan out, its frustrating AMD were not more transparent so now have to wait another month to know exactly how these all really perform.
So with RTXDI, NVIDIA posted some interesting performance numbers for ray tracing vs raster in Unreal Engine 5. RTXDI enables hundreds of ray traced lights per scene, all shadow casting ray traced shadows, with area lights, point lights and emessive properties .. the shadow cast are ray traced...
forum.beyond3d.com
Some preliminary numbers comparing 4090 vs 7900XTX based on published AMD numbers.
Cyberpunk 2077, native 4K:
4090: 40fps
3090Ti: 23fps
6900XT LC: 11fps
7900XTX: 17fps (50% faster than 6900XT LC)
The 4090 is 2.3X faster than 7900XTX, the 3090Ti is 35% faster.
Metro Exodus EE, native 4K:
4090: 87fps
3090Ti: 48fps
6900XT LC: 25fps
7900XTX: 37.5fps (50% faster than 6900XT LC)
The 4090 is 2.3X faster than 7900XTX, the 3090Ti is 28% faster.
Dying Light 2 native 4K:
4090: 44fps
3090Ti: 24fps
6900XT LC: 11fps
7900XTX: 20fps (56% faster than 6900XT LC)
The 4090 is 2.2X faster than 7900XTX, the 3090Ti is 20% faster
Hitman 3 native 4K:
4090: 43fps
3090Ti: 23fps
6900XT LC: 16fps
7900XTX: 26fps (85% faster than 6900XT LC)
The 4090 is 65% faster than 7900XTX