Until now, it was thought that AMD’s RDNA 3 architecture Navi 33 GPUs would feature 5,120 cores or 20 WGPs, but this information has now been rectified to reduce the number of cores to 4,096, far fewer than previously thought. However, they also comment that this does not mean that its overall performance has changed, and the Navi 33 is expected to offer a performance superior to current Navi 21 that currently enhance the AMD TOP GPU for the high-end segment.
One of the interesting things about this Navi 33 GPU is that it will have a monolithic architecture, unlike the higher chips, and it will also have a single die. The internal layout is quite similar to that of Navi 21, and it is expected that a node with TSMC 6nm lithography will be used for its manufacture, although this is yet to be confirmed.
In theory, the Navi 33 chips will feature 2 shader engines, each with 2 shader arrays (4 in total). Previously, each array was expected to have 5 WGPs (10 per SE, 20 total), while each WGP would have 8 SIMD32 units with 32 ALUs (160 total, therefore). These SIMD32 units would combine to make a total of 5,120 cores, the same number as the RX 6900 XT with Navi 21 XTX GPUs.
However, it seems that things are going to change quite a bit; According to the new rumored numbers, the AMD Navi 33 GPU will have a total of 16 WGP or 4,096 Cores. Now we don’t know if this is the configuration of an individual chip or if all Radeon RX 7700 Series will work this way, since in the end this would mean that AMD would have disabled 1 WGP in each Shader Array.
That’s true. N33 = N23 + GFX11.
– kopite7kimi (@ kopite7kimi) September 29, 2021
As if this were not enough, the popular filter kopite7kimi affirms, as you can see above these lines, that Navi 33 is the replacement for Navi 23 in the GFX11 architecture, despite the fact that Navi 23 has only 2,048 cores, half of what Navi 33 supposedly has.
If this is true, and taking into account that the Navi 23 GPU is the one that powers the AMD Radeon RX 6600 series of graphics cards, it would mean that the Navi 33 would be the chip chosen by AMD for the RX 7600 and not for the RX 7700 Series. Obviously AMD could opt for another strategy which would be to “level up” the Navi 33 so that it would effectively power the RX 7700, leaving Navi 31 for the RX 7900, Navi 32 for the RX 7800 and Navi 33 for the RX 7700, which seems the most logical on the other hand. Thus, the RX 7600 series and below would still use RDNA 2 architecture GPUs but upgraded with 6nm lithography.
As you can see, there is still absolutely nothing that is confirmed and not even clear, so we will have to wait, as always, for AMD to take the next step.