One thing to keep in mind: a lot of the die real estate in modern processors is spent on doing tasks other than calculating hashes (a lot of it is caches https:

One thing to keep in mind: a lot of the die real estate in modern processors is spent on doing tasks other than calculating hashes (a lot of it is caches https://www.servethehome.com/amd-epyc-7000-series-architecture-overview-non-ce-ee-majors/ https://www.servethehome.com/amd-epyc-7000-series-architectu... ). Someone using an FPGA or ASIC can dedicate almost all of the die to creating lots of SHA-256 units.