A few renders of what a possible AMD Navi 4X Halo GPU based on the RDNA 4 architecture have been published which should us a glimpse of what this flagship gaming chip could've been.
AMD's High-End Navi 4X Halo GPU Featuring The RDNA 4 Architecture Appears In Conceptual Renders
You may have heard the rumor of AMD canceling its high-end RDNA 4 GPUs and focusing on the mainstream SKUs such as Navi 43 and Navi 44. There were also rumors that the high-end chips included SKUs such as the Navi 4C and Navi 4X which were supposed to go all out with an MCM design.
Now based on some concepts of what this high-end chip might've been, Twitter fellow, Olrak29, has posted a few diagrams of the chip which have further received full-on renders by @creper9000. Do note that these are just conceptual images and may or may not represent the final product.
AMD RDNA 4 "Navi 4X" GPU Block Diagram (Credits: Olrak29_):
Starting with the first image, we have a basic package that is composed of three main parts, the AID, SED (Shader Engine Die), and the MID (Multimedia & I/O Die). According to the early details revealed by Moore's Law is Dead, the AID and MID would have been featured on the base die & SEDs would've been featured on the AIDs in groups of three. The base-layer would've featured a total of three AID's an d a single MID interconnected with a Die-to-Die interconnect and each AID would have carried three SED's and connected via the same interconnect fabric.
The AIDs for Navi 4X GPUs based on the AMD RDNA 4 graphics architecture might've featured the Infinity Cache, interconnects, and GDDR PHYs. The TSVs to connect the SED's to the AID's would've also been on the AID portion of the chip. As for the MID, it might've carried the VCN, DCN, PCIe & I/O of the chip. The physical package of the whole Navi 4X Halo GPU is said to have been very big.
AMD RDNA 4 "Navi 4X" GPU Renders (Credits: Creper9000):
Based on all of the information, Creper9000 came up with some nicely rendered images of the whole chip which indeed looks gargantuan & shows us what the future might hold for the MCM technology. Early renders of the AMD Navi 3X "RDNA 3" GPU lineup were also very close to the final retail chips but if the high-end Navi 4X GPUs are indeed cancelled, then they may only live in the form of renders and we can expect a similar MCM solution in a future generation.
While this is still a rumor and nothing has officially been confirmed by AMD as of yet, the RDNA 4 lineup is seemingly only going to get Navi 44 and Navi 43 SKUs with the Navi 42 and Navi 41 chips probably out of the equation (for now). The lineup is expected to launch sometime in 2024 so there's still a lot of time left in launch and the company is definitely not done with its RDNA 3 family yet which will be receiving more updates later this fall.
AMD RDNA Generational GPU Lineup
| Radeon Lineup | Radeon RX 5000 | Radeon RX 6000 | Radeon RX 7000 | Radeon RX 8000 |
|---|---|---|---|---|
| GPU Architecture | RDNA 1 | RDNA 2 | RDNA 3 / RDNA 2 | RDNA 4 |
| Process Node | 7nm | 7nm | 5nm/6nm | 5nm/3nm? |
| GPU Family | Navi 1X | Navi 2X | Navi 3X | Navi 4X |
| Flagship GPU | N/A | Navi 21 (5120 SPs) | Navi 31 (6144 SPs) | Navi 41 (Cancelled?) |
| High-End GPU | Navi 10 (2560 SPs) | Navi 22 (2560 SPs) | Navi 32 (4096 SPs) | Navi 42 |
| Mid-Tier GPU | Navi 12 (2560 SPs) | Navi 23 (2048 SPs) | Navi 33 (2048 SPs) | Navi 43 |
| Entry-Tier GPU | Navi 14 (1536 SPs) | Navi 24 (1024 SPs) | Navi 34 (1024 SPs)? | Navi 44 |
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