Just read the 7900 xtx creators review on techgage. Would be good to do these tests for Macs as well.
https://techgage.com/article/amd-radeon-rx-7900-xt-radeon-rx-7900-xtx-creator-review/
I tried out 2 of the tests since the blender scenes are just standard scenes that are freely available.
Maybe I did something wrong but just testing the first blender example scene renders in about 9 mins(canceled the render at 20% after 2 mins) on my 16" m1 Max (32). On a 7900xtx that render takes less than 2 minutes in total and a 4090 finishes in just 21 secs... I guess that is a scene that is extra well suited for RT HW with all the small details but using quite simple shading. However, the diff in speed between the M1 series and PC based solution is quite extreme and shows why there is a need for RT hardware on a pro machine if it is to be used for 3D beyond a few stills from time to time. I also quickly tested the eevee scene and got render times for 100 frames in around 290s (slightly slower than a nvidia 3050 but faster than a radeon 6500xt. 7900 xtx did the 100 frames in 65 sec)
Eevee tests done on Blender 3.5 alpha using metal viewport.
I know some of you like to say that render times doesn't matter and we should not compare to PC. I totally disagree and we must know what the alternative solution is at. All in all, we better hope that Apples m2 pro/max/ultra chips have HW RT or we will have to wait another 1.5 years hoping for the M3 series.