That's the thing with TBDR. Because of its efficiency it doesn't need as much memory bandwidth as IMR. "It drastically saves on memory bandwidth because of the unified memory architecture". Here are two other articles that explain the details more:
Learn about characteristic Apple GPU features, including imageblocks, tile shaders, and raster order groups.
developer.apple.com
WWDC20 has been an event of major changes. All operating systems had significant design changes. The new macOS named Big Sur is now version 11. The biggest announcemen…
metalkit.org
Yes, PS5 and Xbox X use SoC GPUs. Xbox with 52 CUs at 12 TFLOPs and PS5 with 36 CUs at 10 TFLOPS. This is a good sign. If they (AMD) can make such powerful GPUs then Apple should also be able to do so for its desktop computers like iMac.