AMD’s Next-Gen Flagship RDNA 3 GPU Die May Be A lot Smaller Than You Suppose
On: July 22, 2022
520 mm²—that is the dimensions of the Navi 21 GPU used within the Radeon RX 6800, RX 6800 XT, RX 6900 XT, and RX 6950 XT. Even although it is dwarfed by NVIDIA’s largest GPUs, that is nonetheless a critically sizable chip. Rumors had positioned the top-end RDNA 3-based half within the Radeon RX 7000 sequence at a barely bigger measurement, circa 600 mm², however that quantity is sophisticated by these components’ chiplet-based design.
The newest data appears to point that the top-end RDNA 3 design, generally known as Navi 31, may have a single “Graphics Compute Die” (GCD) flanked by six Memory Controller Dice or Memory and Cache Dice (MCDs). The graphics compute die is clearly where the magic will occur, whereas the MCDs will join the chip to GDDR6 reminiscence and cache the contents of stated reminiscence with both 32 or 64 MB of Infinity Cache.
As a part of an extended Twitter thread discussing the upcoming GPUs, business insider and Digimon fanatic Greymon55 peeked in to supply his data to the die space discourse. Another identified leakster, Kepler, had commented that the Navi 31 “total die area” was within the ballpark of 600 mm², which is in step with earlier rumors.
According to Greymon55, the GCD, the precise “processing” a part of the GPU, will solely be 350 mm². This is controversial primarily as a result of looks as if an improbably small processor for the expected specs of Navi 31. The top-end RDNA 3 half is anticipated to have 2.4x the shader cores of Navi 21, and even when we account for the shift to TSMC 5N, in addition to the elimination of the reminiscence interfaces and Infinity Cache from Navi 21, we’d nonetheless be some 375 mm², in accordance with German site 3DCenter.
Kepler and Greymon55 are literally in settlement on the die space. Kepler’s unique assertion about “total die area” appears to have been together with the six MCDs that we count on the ultimate product to have. He himself commented on the shock on the die space prediction, noting that the RDNA 3 structure really discards “a lot of old architectural bloat.”
That contains issues just like the XGMI GPU-to-GPU interface that was used on the Radeon Pro Duo, the legacy geometry pipeline (that means that RDNA 3 solely makes use of the Next Generation Geometry design that was applied however not practical in Vega), the legacy scan converter is gone so there is not any hope for analog outputs on these chips, and Vega’s Global Data Share perform is outwardly eliminated, too.
So saying, the Navi 31 GCD seems to be very dense with compute certainly. We’re dying to seek out out whether or not this Radeon GPU can compete with NVIDIA’s monstrous monolithic AD102. Both playing cards ought to be out by the tip of the yr.
