Real-time ray tracing is incredibly demanding. The latest graphics cards have dedicated hardware that’s optimized for ray-tracing. The 3DMark DirectX Raytracing feature test measures the performance of this dedicated hardware. Instead of using traditional rendering techniques, the whole scene is ray-traced and drawn in one pass. The result of the test depends entirely on ray-tracing performance. (UL).
As for the 3DMark DXR feature-test, here the RTX 3080 Ti is 4% behind the RTX 3090. This is still a very small difference between the two, but it is slightly larger than what we saw from the regular 3DMark benchmarks, which we'd say is a result of this test's complete reliance on ray tracing hardware.