
Allegedly, RDNA4 use multi-chip module (MCM) design, just like RDNA3, for at least some SKUs. Greymon55's information indicates RDNA4 will use 5nm I/O dies and 3nm graphics tiles. The upcoming RDNA3 MCM GPUs are expected to use 6nm I/O dies and 5nm graphics tiles.
AMD Radeon RX 8000 series are not expected to launch till at least late 2023. The specifications of Navi4X are currently unknown as they are still actively being developed by AMD. AMD RDNA4 GPUs might compete with NVIDIA Ada Lovelace’s successor, which has far not been named and at the same time, with Intel DG3 family of GPUs codenamed Arc Battlemage.
No, RDNA4 is a full product line with a common architecture, and RDNA4 MCM will use 3nm+5nm.
— Greymon55 (@greymon55) August 19, 2021