NVIDIA RTX logic increases die area by just 22 percent?

Posted on Tuesday, Apr 09 2019 @ 09:26 CEST by Thomas De Maesschalck
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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.

About the Author

Thomas De Maesschalck

Thomas has been messing with computer since early childhood and firmly believes the Internet is the best thing since sliced bread. Enjoys playing with new tech, is fascinated by science, and passionate about financial markets. When not behind a computer, he can be found with running shoes on or lifting heavy weights in the weight room.

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