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Smallest probably 7nm Intel in Ireland. Not sure it is online yet though

Intel Ireland (Fab 24/34) will be producing Intel 4 and 3, which is an EUV based node

So potentially they could even go to finer architectures?

Intel has stopped using "nm" - it's meaningless anyway; hasn't been meaningful since 1994 (https://en.wikipedia.org/wiki/Semiconductor_device_fabricati...).

Now it's just Intel 7 (currently in use), Intel 4 (successor to Intel 7 for internal use) and Intel 3 (based off Intel 4 for their foundry services).