One of the reasons why a processor, of whatever type, is broken down into several chiplets, in order to thus exceed the limit of the grid that the wafer allows. This allows for more complex configurations than with a monolithic chip. This has been executed by AMD in its CPUs from its Ryzen 3000 on the desktop, however, in graphic cards we will see it from the Ryzen 7000 with RDNA 3 architecture.
The new design from the Radeon Technology Group will divide the GPU into two different types of chips. The first one called GCD will have what is the GPU itself and the caches up to the second level, a configuration may have several GCDs, but from the second it will be subordinate to the first. On the other side will be the MCD, which includes the Northbridge of the GPU and, therefore, its interface with the VRAM, the LLC as Infinity Caché, as well as the accelerators such as the DMA units, the display controller, the video codec etc.
AMD will reach 3 GHz with its Navi 3x GPUs
First of all, we must remember that the information that we are going to comment is not official from AMD, but comes from what has been leaked together with a series of speculations. So the information you see in the tweet above is a mix of information and speculation.
The most powerful GPU under RDNA 3 architecture that we will see will be Navi 31, which will have a configuration of 60 WGP and, therefore, 120 Compute Units. 50% more than the current RX 6900 XT. The RX 7900 XT will consist of two GCD and one MCD with 256 MB of Infinity Cache, which would be installed in V-Cache mode. The three chips will be on top of a common interposer and with a configuration of 16GB GDDR6 with a 256-bit bus. As for his clock speed is 2.5 GHz.
Secondly, we have Navi 32, which we are supposed to see in the RX 7700 XT, its configuration is 40 WGP and, therefore, of 80 Compute Units, the same configuration as the current Navi 21. However, the similarities end there, since it will be a configuration of a GCD and a MCD, where the latter has a 192MB Infinity Cache. As for the bus with the memory, this will be 192 bits, so it will have a configuration of 12 GB memory. The Boost of these GPUs could reach 2.6 and 2.8 GHz.
To finish, the third GPU will be Navi 33, with a configuration of 16 WGP and, therefore, 32 Compute Units, the same as the current Navi 23. The difference would be that it would have a 64MB Infinity Cache. This AMD GPU will go to 3 GHz maximum speed, being the first graphics card in history to reach it. Your VRAM configuration? 8GB GDDR6 a bus of 128 bits.
Navi 33 could be the first to appear
Apart from the leaked rumors, the information that has been appearing in recent weeks tells us that Navi 33 could be the first GPU under RDNA 3 architecture to also appear in the form of a monolithic chip under the TSMC 6 nm node, while Navi 31 and Navi 32 will use TSMC’s 5nm node. This makes us think that Navi 33 could be a rebranding with more cache.
In any case, what does not suit us is the configuration of 60 WGP with 2 GCD and 40 WGP for 1 GCD, since we should see configurations of 80 WGP with 2 GCD and 30 WGP with only one. There is still time for AMD to release information, although we await the first details of RDNA 3 at CES as a sneak peek.
