AMD is alleged to have used its Navi 4C “RDNA 4” MCM GPUs to power the next-gen Radeon RX 8000 lover graphics cards.
AMD Navi 4C “RDNA 4” MCM GPUs Are Rumored To Be Part of The Now Defunct Radeon RX 8000 Graphics Cards
You may have seen the recent story where it was rumored that AMD canceled its high-end RDNA 4 GPUs if you have actually been reading our current stories. Well, it appears like Moore’s Law is Dead might have some additional information on a specific SKU that was suggested to be part of the new GPU lineup however was slashed out in favor of more mainstream GPUs.
MLID has published a supposed diagram of what seems to be a Navi 4C GPU which was to be among the three Navi 4 setups based on the RDNA 4 architecture with the other two being Navi 4X and Navi 4M, as revealed by Kepler_L2 a couple of months back. The Navi 4C configuration mainly seems a very sophisticated MCM (Multi-Chip-Module) design that utilized different foundation.
Couple of more codenames Navi4X
Navi4M
Navi4CMI400 Mercury/Venus/Earth
— Kepler (@Kepler_L2) April 18, 2023
The base layer of the AMD Navi 4C (RDNA 4) GPU was the package substrate that would hold numerous AID’s and MID’s on top of it. The AID is an active interposer pass away and there are 4 of those which are accompanied by a single MID or Multimedia & I/O pass away which was supposed to be similar to the MCD included on the existing Navi 31 and Navi 32 MCM GPUs. This chiplet consisted of the VRAM bus controllers and the Infinity Cache along with other multimedia capabilities. The MID linked to the AID using a next-gen adjoin material and the AIDs were likewise adjoined to each other utilizing the exact same material.
Now for each AID, there were 3 SED’s layered on top in a stacked chiplet setup. These SED’s (Shader Engine Die) were the primary GPU IP obstructs performing the shader tasks. The diagram reveals that there were at least 9 SED’s on this Navi 4C configuration based on the RDNA 4 graphics architecture. The whole plan was based upon TSMC’s COW-V TSV (Chip-On-Wafer) technology and was going to include a number of setups however considering that we do not learn about the exact setup or CU/WGP design of RDNA 4, it’s prematurely to state what this chip may’ve been used for. You can also discover the reference of SED, AER, and MID’s in this patent here which the following diagrams are from:
2 of 9 The leaker mentions that this particular setup was anticipated to be featured on the AMD Radeon RX 8900 XTX which should’ve been an ultra-enthusiast item since it changed the 7900 XTX however it appears like that isn’t the case any longer and the chiplet design of such a scale isn’t prepared at least the RDNA 4 generation of GPUs. It is likely that the company didn’t meet its targets or expectations with the RDNA 3 lineup and went back to the drawing board to set things straight for future MCM styles.
While this is still a report and absolutely nothing has actually officially been validated by AMD since yet, the RDNA 4 lineup is seemingly just going to get Navi 44 and Navi 43 SKUs with the Navi 42 and Navi 41 chips probably out of the equation (in the meantime). The lineup is anticipated to launch sometime in 2024 so there’s still a great deal of time left in launch and the business is absolutely not done with its RDNA 3 household yet which will be getting more updates later on this fall.