AMD “Ryzen C7” Smartphone SoC Specifications Listed

Power Budget, Transistor Budget.

But in reality Cortex X-1 ( by default excluding custom changes ) is pretty much the same as Cortex - A78 but increase both internal and external bandwidth and cache along with double NEON unit. While the low performance is a completely different design.

I still dont know how these thing schedule their workload.

Samsung and AMD are collaborating and coming up with a SoC with ARM Cortex X1, A78 and A55 based CPU and AMD is providing the GPU.

On other hand, it sounds way more real than previous rumours of AMD slapping ARM frontend onto Zen

Maybe they aren't sure if they can get their 5nm running?

If you consider when their collaboration were announced and product shipping within ~18 months it seems the only choice would be to use TSMC instead of their own Fab, given both ARM and AMD has many experience with TSMC and the Cortex-X1 design likely have blueprint ready on TSMC.