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GribbleGrunger said:
I wonder if AMD have done a deal with Sony and also modified their future chips in line with Sony's own changes?
...
Have Sony allowed AMD to copy their changes in exchange for cheaper chipsets?

That is pretty much what I am thiniking, too. Tit for tat - there is no apparent reason that both companies could not profit from such an exchange.  And this stuff is expensive, very expensive since it is brand new, untested chips. There is also this tidbit which one has to read very carefully to understand correctly:

"He said, "Everything that Sony has shared in that single chip is AMD [intellectual property], but we ..."


That does not mean that AMD "owns" the PS4 SoC at all. What it means is that there are design features in the SoC that Sony does NOT share with AMD! Certainly the "Share button" hardware is one of those things, the extra command bus between the two cpu modules and gpu probably is another one. Then the question how the gddr5 memory is tacked to the various processors. Since AMD has experience with ring bus architecture in its gpus, I was thinking it is a ring bus, but nothing has been said yet - if it ever will be disclosed.