Mostly Taiwan. South Korea doesn’t do it for protection, if it did well they screwed up badly because samsung botched their nodes even worse than intel did for years.
Intel is reliant on Israel for engineers. Very difficult to replace and unlikely that they would move over to the US. The brain drain in the US is real in part thanks to EE wages not matching up with booming software engineering wages and the US treating manufacturing like an afterthought in general.
well technically the high freq chips right now are out of spec and overclocked. people just don’t care because chances are good that they work. XMP/EXPO are overclocks but people treat them like standard settings.
so it makes sense that current IMCs and boards are struggling with these speeds since they’re far out of the spec they were designed for years ago.