Spotted: possible 3D V-Cache connections in AMD's latest RDNA 3 GPUs. Whether AMD will do anything with them is another thing entirely...
have revealed what appear to be connection points used with 3D chip stacking technologies. Engineer Tom Wassick has zoomed in on the memory chiplets within the Navi 31 GPU, known as MCDs, and what he's found are tiny"spots" that appear similar to those on AMD's V-Cache CPUs.), who has viewed AMD's latest GPU with an infrared camera, these spots could show a latent ability in the RDNA 3 GPU that would allow AMD to stack another chip on top of the MCD.
What else can you see? A linear array of"spots" that look remarkably like the keep out zones on X3D, and that are on the same 17-18 um pitch. Could they be considering stacked MCD functionality ?It was rumoured back in the development process for the Navi 31 GPU that AMD would implement stacked MCDs, but reportedly decided against it, at least for the first chips. There have been rumours of a Navi 31 refresh later in the year, but equally contrasting rumours claiming such a refresh.
These connection points could then either be legacy connections from older plans for the GPU memory dies, or paving the way for a future upgrade. How that could take shape, if it ever does, remains a mystery, but in theory a GPU could benefit from having more memory close at hand as much as a CPU. AMD has found extra performance from bumping up the cache capacity on both its latest GPUs and CPUs. The Infinity Cache introduced with the Ryzen 6000-series graphics cards helped increase its available memory bandwidth, and the first processor with 3D V-Cache technology, the, runs significantly faster than the Ryzen 7 5800X in cache-heavy workloads .
Nvidia has also followed AMD's lead, massively increasing the L2 cache on its Ada Lovelace-based graphics cards of the RTX 40-series. No doubt AMD will be looking to other implementations of the technology to once again maximise performance itself.
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