At this point, it is a matter of whether N23 has taped out and if the silicon is ready. If not AMD would rebrand Navi10 to cover the lower performance tier.
Otherwise no point in fabbing a 251mm2 die which can be outperformed by a 240mm2 die on two largely similar processes with simliar costs and using almost 90% common equipment.
P10 existed for a while due to being cheaper to manufcature and WSA to some extent.
Since AMD already ported RDNA2 on N7(P) for the consoles it wouldn't be much of a challenge to repeat for N23. Much of the work is done.
- Designing around the same libraries and tool kits
- Porting design to N7(P) PDK
- Synthesis, timing analysis and simulations largely the same.
- For similar Navi2x design, it would be a matter of configuration of the blocks, redo the floor plan and place and route and other small backend steps
Still there are costs and effort involved but nowhere near porting to a new PDK and new libraries and the functional blocks have already been designed, so it is about ROI whether it makes business sense. If there is money to be gained they will do it.
I prepared a sample workflow using older design flow, but still generically OK.
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