AMD Radeon cards with 3D V-Cache may become a reality as Navi 31 GPU found to integrate possible connection site for 3D cache
The next generation of desktop AMD Ryzen 7000 CPUs with 3D V-Cache are poised to hit the market in February. The inclusion of a 3D V-Cache drastically increases CPU performance in certain workloads, including gaming, as demonstrated by the Ryzen 7 5800X3D. Interestingly enough, we may see 3D stacked cache make its way into future AMD Radeon desktop GPUs if a recent discovery from Tom Wassick, a semiconductor packaging engineer, is any indication.
Tom used infrared (IR) imaging to examine the Navi 31 GPU inside an RX 7900 XT. The imaging revealed "spots" that he suggests “look remarkably like the keep out zones on X3D” prompting speculation that AMD might package 3D V-Cache on future Radeon boards.
Replying to the engineer’s tweet, SkyJuice from Angstronomics remarked that all Memory Cache Dies (MCD) have sites for 3D V-Cache printed on the board. SkyJuice has previously mentioned that AMD was preparing a Navi 31 SKU with a 3D stacked MCD that would have taken the total Infinity Cache on board to 192 MB. But we are yet to see such an RDNA 3 SKU.
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 (or maybe they're something else)?— Tom Wassick (@wassickt) January 27, 2023