Very interesting the 4080 Super has 88% of the 5080's performance at 4k, but 90% at 4k ray tracing. I would have expected the ray tracing performance to have a bigger gap than the regular performance, due to improved RT cores and more memory bandwidth from GDDR7.
It seems like RT improvements stopped. They added specific features to it that I suppose games would need to take advantage of (like SER) but raw RT perfomance has stagnated as well.
I mean when 20 series dropped everybody was saying to give it some time then when you turn on RT, there won't be performance penalty, it will be like Tesselation. But we are now on 50 series and that hasn't happened.
Hard to say why exactly since Nvidia keeps shut what RT cores are exactly doing, its a secret.
EDIT
Just checked Guru3d review as they have 3dmark Port Royale and DXR benchmarks and improvement in Port Royale is there but not as much as from 3080 to 4080. And even more strange DXR perf is lower, must be some bug in either drivers or 3dmark.