That goes along with what a few others have said, AMD's version of RT is very fast at low/medium quality levels, the ray-box rate, so 'performance' mode as per what Nvidia call it, would have very little hit on fps on RDNA2, however for 'quality' mode, increasing everything up to ultra RT, would cause a bigger hit and drop it down to between 3070 and 3080 levels.
Ah yep that sounds about right. From what I understand, the Ray box is calculating what parts of the scene need to be traced (Navi 21 has 28% advantage) and Ray tri does the tracing (Ampere has 54% advantage) - so architecturally speaking AMD's solution is faster at computing what it needs to do, but slower at doing it - this leads onto what you mentioned, in scenes with light amounts or lower quality of ray tracing AMD's solution could be faster than Nvidias but if the ray tracing quality or amount settings are turned up, Nvidia takes the advantage back - at least that seems to be the case if this chart is correct
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