> who is going to produce this S1 CPU and which node size
> and technology will be used?

No definite answers on this yet but some more general info:

"I asked Timothy Pearson at Raptor about the S1's specs, and he said it's a PCIe 5.0 DDR5 part running from the high 3GHz to low 4GHz clock range, with the exact frequency range to be determined. (OMI-based RAM not required!) The S1 is bi-endian, SMT-4 and will support at least two sockets with an 18-core option confirmed for certain and others to be evaluated."
https://www.talospace.com/2023/10/the-next-raptor-openpower-systems-are.html