IMO it will look like this:
DX300 - 2048 GCN cores, 4 GB of GDDR5
DX500 - 2304 GCN cores, 8 GB of GDDR5
DX700 - more than 2304 GCN cores, less than 4096, 8 GB of HBM2
So far Zauba shipping manifests indicate that first GPU with C99XXX moniker will have 3 times higher cost than RX 480, and that the second GPU with C99XXX moniker will have 4 times higher price than Polaris 10.
Note that there is no difference in cost of GPUs using the same die, because you pay for die, regardless if it is fully functioning or not, at least thats what we can draw from looking at shipping manifests on Zauba.
So there are 4 GPU dies coming from AMD currently made on 14/16 nm process: Polaris 10, Polaris 11, Vega 10, Vega 11.
And every GPU can be custom made, semi-custom design, or fully functional normal GPU in upcoming Mac Pro. It is up to Apple what they will decide.
Interesting thing in this context however is the fact that none of the RX 480 is working fully under macOS Sierra so far, but RX 470 - is.
So either Apple will go for RX 470 as base model, and higher tiers are based on Vega, or we will have huge surprises on release.
P.I. I genuinely thought that difference between RX 480 and GTX 1080 will be much bigger in compute benchmarks. It is not bad, at all.
DX300 - 2048 GCN cores, 4 GB of GDDR5
DX500 - 2304 GCN cores, 8 GB of GDDR5
DX700 - more than 2304 GCN cores, less than 4096, 8 GB of HBM2
So far Zauba shipping manifests indicate that first GPU with C99XXX moniker will have 3 times higher cost than RX 480, and that the second GPU with C99XXX moniker will have 4 times higher price than Polaris 10.
Note that there is no difference in cost of GPUs using the same die, because you pay for die, regardless if it is fully functioning or not, at least thats what we can draw from looking at shipping manifests on Zauba.
So there are 4 GPU dies coming from AMD currently made on 14/16 nm process: Polaris 10, Polaris 11, Vega 10, Vega 11.
And every GPU can be custom made, semi-custom design, or fully functional normal GPU in upcoming Mac Pro. It is up to Apple what they will decide.
Interesting thing in this context however is the fact that none of the RX 480 is working fully under macOS Sierra so far, but RX 470 - is.
So either Apple will go for RX 470 as base model, and higher tiers are based on Vega, or we will have huge surprises on release.
P.I. I genuinely thought that difference between RX 480 and GTX 1080 will be much bigger in compute benchmarks. It is not bad, at all.