Then you read the article and it isn't that amazing.
When we enable the dedicated RT Cores on GeForce RTX GPUs, a substantial load is lifted from the shader cores, further improving performance. And when we examine just the ray tracing subset of the graphics workload, RTX 2080 is upwards of 10x faster.
Turing slices ~30% of the workload due to concurrent INT+FLOAT and possibly FP16
RTX Turing slices ~66% of the workload due to Tensor and RT cores
PS. it also requires 6GB VRAM , only GTX 1060 6GB and GTX 1660 and higher:
Note that only GeForce GTX GPUs with sufficient performance and memory for basic ray tracing capabilities are being enabled by the update, as without specialized hardware such as the RT Cores, ray tracing workloads run concurrently with all other graphics rendering tasks, putting substantial load on the GPU.