Please note that this post is tagged as a rumor.
AMD Rembrandt will not get Infinity Cache
AMD has recently updated the Linux kernel with information on the upcoming Yellow Carp APU.
Yellow Carp is a codename for the upcoming Rembrandt APU for next-gen laptops and next-gen desktop APUs. This is allegedly a successor to Cezanne that would feature mysterious Zen3+ core architecture, so far the only part that appeared on a roadmap with a ‘plus’.
Rembrandt is also bringing a major change in GPU architecture, it will be the first Navi2 (RDNA2) based APU, following Van Gogh, which has not yet been released. For mobile series Rembrandt will be split like Cezanne into H (high performance) and U (low power) series, the leaked roadmap confirmed:
AMD Notebook Roadmap, Source: @Broly_X1
The APU will require a new FP7 socket, which will force laptop makers to adopt existing designs for new motherboards and possibly power and thermal characteristics of the “Yellow Carp” APU series. This is understandable, as Rembrandt brings major changes not only to the CPU and GPU core but also I/O. Rembrandt will be the first AMD APU to support DDR5 and LPDDR5 memory standards. It will also enable PCIe Gen4 support, which is something that Cezanne currently does not.
According to some new information, Rembrandt iGPU will not have Level3 (L3) cache, at least there is no such entry in the recent Linux kernel update (only L1 and L2 cache).
No IC on Rembrandt ?
— Kepler (@Kepler_L2) June 2, 2021
Furthermore, instead of 8 Compute Units per ShaderArray, Rembrandt will have 6. The code does not confirm the full number of CUs in the APU though. The Zen3+ and 6nm fabrication processes have not yet been confirmed either, but they have been repeated in rumors for quite a while, so it would be surprising if they turn out to be false.
|AMD APU/GPU Cache|
|AMD GPU||Alternative||RDNA L1 (GL1)||L2 (TCC)||L3 / Infinity Cache (MALL)|
|Raven / Picasso|
Renoir / Lucienne / Cezanne
|Navi10 / Navi12||128K||4M||—|
|Sienna Cichlid||Navi 21||128K||4M||128M|
|Navy Flounder||Navi 22||128K||3M||96M|
|Dimgrey Cavefish||Navi 23||128K||2M||32M|
|Beige Goby||Navi 24||128K||1M||16M|
Cache Sizes on AMD APUs and GPUs, Source: Coelacanth’s Dream