That particular detail comes from the same post that we reported on this past Saturday, by zhangzhonghao on the ChipHell forums. While the bulk of his post was talking about AMD’s upcoming CPU and GPU PC hardware, he also noted that Sony’s going to be using stacked cache in some fashion for the SoC. This makes sense if the other part of his “leak” is correct and AMD is experimenting with stacked cache on future “Halo” parts to succeed Strix Halo.
Obviously, all of this is completely unsubstantiated rumor, but the details do fit together, and the sources are well-known as folks with insider connections. The idea of the PlayStation 6 sporting bleeding-edge AMD hardware including a stacked-silicon GPU cache is quite exciting for gamers, as any new console launch is—even for pure PC gamers, as it means a new wave of graphics technologies thanks to the new hardware. Let’s hope these leaks hold true.
Hypothetical PlayStation 6 design (top image) imagined by Imagen 3.