According to a report from Kepler_L2,AMD may have discontinued development of the high-end Navi-4X GPUs with RDNA-4 architecture, but leaks and information from the source code give us insight into what could have been. These GPUs were reported to offer 50% more shader engines than the flagship Navi-31 GPUs of the RDNA-3 generation.

The top Navi 4X GPU (“Navi 4C”) was equipped with 9 shader engines, which is a significant increase of 50% compared to the 6 shader engines of Navi 31. This shader engine configuration could have resulted in a total of up to 216 processing units, compared to 96 processing units in Navi 31.
In addition to the increased number of shader engines, Navi 4X would also utilize an innovative chiplet design. This meant that the GPU would consist of multiple GCDs (Graphics Compute Dies) connected together. This design makes it possible to scale performance and efficiency and could become the standard for high-end GPUs in the future.

Cancellation for unknown reasons
Unfortunately, AMD has discontinued the development of the Navi-4X GPUs for unknown reasons. It is possible that it is due to design challenges, yield issues or cost reasons. The canceled Navi-4X GPUs were promising and could have represented a significant leap in performance over the current RDNA-3 generation. The chiplet design could also lead the way for future high-end GPUs.
While we will never know what the Navi-4X GPUs would have actually achieved, the leaks and information provide an exciting insight into the technological innovations AMD is working on. It remains to be seen what technologies AMD will use in future generations of RDNA, but expectations are certainly high after the canceled Navi-4X GPUs.
Source: Kepler_L2
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