AMD is alleged to have utilized its Navi 4C “RDNA 4” MCM GPUs to energy the next-gen Radeon RX 8000 fanatic graphics playing cards.

AMD Navi 4C “RDNA 4” MCM GPUs Are Rumored To Be A part of The Now Defunct Radeon RX 8000 Graphics Playing cards

When you’ve got been studying our latest tales, you will have seen the latest story the place it was rumored that AMD canceled its high-end RDNA 4 GPUs. Properly, it seems like Moore’s Regulation is Useless might need some further data on a selected SKU that was meant to be a part of the brand new GPU lineup however was slashed out in favor of extra mainstream GPUs.

MLID has posted an alleged diagram of what appears to be a Navi 4C GPU which was to be one of many three Navi 4 configurations primarily based on the RDNA 4 structure with the opposite two being Navi 4X and Navi 4M, as disclosed by Kepler_L2 a few months back. The Navi 4C configuration largely seems to be a really superior MCM (Multi-Chip-Module) design that utilized numerous constructing blocks.

Few extra codenames 🙂

Navi4X
Navi4M
Navi4C

MI400 Mercury/Venus/Earth

— Kepler (@Kepler_L2) April 18, 2023

The bottom layer of the AMD Navi 4C (RDNA 4) GPU was the package deal substrate that might maintain a number of AID’s and MID’s on prime of it. The AID is an lively interposer die and there are 4 of these that are accompanied by a single MID or Multimedia & I/O die which was purported to be just like the MCD featured on the prevailing Navi 31 and Navi 32 MCM GPUs. This chiplet included the VRAM bus controllers and the Infinity Cache together with different multimedia capabilities. The MID related to the AID utilizing a next-gen interconnect cloth and the AIDs had been additionally interconnected to one another utilizing the identical cloth.

Now for every AID, there have been three SED’s layered on prime in a stacked chiplet configuration. These SED’s (Shader Engine Die) had been the primary GPU IP blocks performing the shader duties. The diagram reveals that there have been not less than 9 SED’s on this Navi 4C configuration primarily based on the RDNA 4 graphics structure. The entire package deal was primarily based on TSMC’s COW-V TSV (Chip-On-Wafer) expertise and was going to incorporate a number of configurations however since we do not know concerning the precise configuration or CU/WGP structure of RDNA 4, it is too early to state what this chip may’ve been used for. You may also discover the point out of SED, AER, and MID’s on this patent right here which the next diagrams are from:

The leaker states that this particular configuration was anticipated to be featured on the AMD Radeon RX 8900 XTX which ought to’ve been an ultra-enthusiast product because it changed the 7900 XTX however it seems like that is not the case anymore and the chiplet design of such a scale is not prepared not less than the RDNA 4 technology of GPUs. It’s probably that the corporate did not meet its targets or expectations with the RDNA 3 lineup and went again to the drafting board to set issues straight for future MCM designs.

Whereas that is nonetheless a rumor and nothing has formally been confirmed by AMD as of but, the RDNA 4 lineup is seemingly solely going to get Navi 44 and Navi 43 SKUs with the Navi 42 and Navi 41 chips most likely out of the equation (for now). The lineup is anticipated to launch someday in 2024 so there’s nonetheless a whole lot of time left in launch and the corporate is certainly not accomplished with its RDNA 3 household but which will likely be receiving extra updates later this fall.

AMD RDNA Generational GPU Lineup

Information Sources: Videocardz, Olrak29