I think MS will use it,but it will for sure be customize. We don't know what agreement is between SONY and AMD. I think is not about royality, more about some design choices that are gonna be custom and exclussive for PS5. Sony won't tell you right now, its too early, but for sure they didn't co-developed and co-found the NAVI for free.
Im sure all they did was a few key features that they wanted, but probably set it apart enough.
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