AMD Linux patches reveal no Infinity Cache for the Phoenix Point APU and only four displays at a time for the RDNA3 GPUs
It seems like the prelaunch setup for AMD’s RDNA3 graphics processors is underway as Coelacanth’s Dream has found evidence of four RDNA3 device IDs in AMD’s Linux patches. The four IDs refer to three RDNA3 dGPUs, the Navi 31 (GFX1100), 32 (GFX1101), and 33 (GFX1102), and the AMD Phoenix Point APU. Upon digging through the patches, Coelacanth’s Dream also uncovered some interesting information about AMD’s Display Core Next (DCN) display controllers.
Reportedly, the GFX1103 GPU or Phoenix Point APU will have DCN 3.1.4 and the RDNA3 GPUs will come with DCN 3.2.x engine. VideoCardz notes that, aside from the version numbers, there is no obvious difference between DCN 3.1.4 and DCN 3.2.x engines. Furthermore, both DCN versions will allegedly only support four displays at a time.
Interestingly, Coelacanth’s Dream hasn’t found any data relating to Memory Access at Last Level (MALL) for the Phoenix Point APU. MALL is another way to refer to Infinity Cache, the large L3 cache that AMD uses in its RDNA2 GPUs to remove memory bottlenecks, increase bandwidth, and improve efficiency. If true, this would mean that AMD will reserve Infinity Cache for its discreet RDNA3 offerings and leave out the Phoenix Point RDNA3 APU.
AMD is targeting a Q4 2022 launch for its next-generation Radeon RX 7000 series chips. So, we’ll know soon enough how much of the information uncovered by Coelacanth’s Dream is factual.