Shut up images AMD’s RX 7900 XT (Opens in a brand new tab) It revealed what seem like contact factors used with 3D chip stacking methods. Engineer Tom Wassick zoomed in on the reminiscence chips contained in the Navi 31 GPU, generally known as MCDs, and what he discovered have been small “blobs” that regarded much like these on AMD’s V-Cache CPUs.
In line with Wasik (Heb tom devices (Opens in a brand new tab)), who noticed AMD’s newest GPU with an infrared digicam, these spots may present a latent functionality within the RDNA 3 GPU that will permit AMD to stack one other chip on high of the MCD.
What else are you able to see? A linear group of “dots” that look remarkably just like the safety zones on the X3D, that are on the identical pitch 17-18 um. Might they be contemplating stacked MCD capabilities (or perhaps one thing else)?January 27, 2023
It was rumored again within the Navi 31 GPU growth course of that AMD would implement stacked MCDs, however reportedly determined towards it, at the very least for the primary chips. There have been rumors of a Navi 31 replace later within the 12 months, however contradictory rumors declare such an replace. canned (Opens in a brand new tab). Being able to considerably improve the obtainable cache reminiscence for RX 7900 collection playing cards would have been a strong software in AMD’s arsenal for any potential later improve.
These hotspots can both be legacy connections from previous plans for GPU reminiscence dying, or set the stage for a future improve. How that may form up, if it does, stays a thriller, however theoretically the GPU may benefit from having extra reminiscence readily available because the CPU.
AMD has discovered extra efficiency by rising cache capability in its newest GPUs and CPUs. Infinity Cache launched with Ryzen 6000-series graphics playing cards helped improve obtainable reminiscence bandwidth, and the primary processor with 3D V-Cache expertise, Ryzen 7 5800X3D (Opens in a brand new tab)It runs noticeably sooner than the Ryzen 7 5800X on cache-heavy workloads (i.e. video games). Additionally it is anticipated that this sort of efficiency will probably be raised sooner or later Ryzen 7000-series V-Cache (Opens in a brand new tab) Which is poised for battle towards Intel’s Raptor Lake processors someday in February. Whereas at the moment’s Ryzen 7000 collection tends to lose that battle, 3D V-Cache chips are anticipated to be extra aggressive, probably topping the efficiency charts.
Nvidia has additionally adopted AMD’s lead, considerably rising the L2 cache on Ada Lovelace-based graphics playing cards for the RTX 40 collection. Little doubt AMD will look to different purposes of the expertise to maximise the identical efficiency once more.
Each fashions are the RX 7900 XT and RX 7900 XTX (Opens in a brand new tab) It comes with a chiplet-based GPU, which is able to play a serious position if AMD is seeking to increase cache quantities on its GPU with chip-stacking expertise.
The Navi 31 GPU is split into two part components: GCD and MCD. There are six MCDs on the XTX and 5 on the XT, though it appears like an XTX due to a dummy block of silicon changing the sixth MCD. In principle, AMD may improve the variety of reminiscence chips with 3D V-Cache, all with out increasing the general GPU footprint.
Sadly, that is only a dream, although clear indications of the chip stack’s potential might point out what’s to return from the pink staff. For now, we’re hoping for a fast launch of some cheaper graphics playing cards from the RDNA 3 structure, however preserve your eyes on the horizon for a chip-based, 3D-stacked behemoth. We are able to solely hope that that is one thing the pink staff has in thoughts, and never one thing that’s truly prepared.
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