NVIDIA RTX logic increases die area by just 22 percent?

TechPowerUp writes an investigation of NVIDIA's Turing series reveals the extra logic for the real-time ray-tracing capability may be smaller than expected. Reddit user Qesa analyzed the TU106 and TU116 chips and concludes the RTX logic in the TU106 amounts to a just 22 percent die size area increase version the RTX-stripped TU116:

After analyzing full, high-res images of NVIDIA's TU106 and TU116 chips, reddit user @Qesa did some analysis on the TPC structure of NVIDIA's Turing chips, and arrived at the conclusion that the difference between NVIDIA's RTX-capable TU106 compared to their RTX-stripped TU116 amounts to a mere 1.95 mm² of additional logic per TPC - a 22% area increase. Of these, 1.25 mm² are reserved for the Tensor logic (which accelerates both DLSS and de-noising on ray-traced workloads), while only 0.7 mm² are being used for the RT cores.

If the math is accurate, RTX increased the die size of the GeForce RTX 2080 Ti from 684mm² to 754mm².