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If you were wondering why TSMC's stock price jumped up initially this morning in Taiwan (but down in the US stock market because of the Apple news)...I believe I have your answer
I have heard N3 in second half 2022, Q4 2022, and now early 2023. Hopefully there will be a big turnout at the conferences in the next two weeks (DAC, RISC-V, Semicon West, and IEDM) so we find out more from the people who actually know.
It used to lag 6-12 months but now with Intel, AMD and Nvidia working closely with TSMC on N3 they were supposed to be parallel. From what I heard the HPC has been delayed and will be called N3E so we are back to the 6-12 month delay but that was not the original plan.