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You want RAM because you don’t want to have your computer store and constantly read/write to through TBs of temporary/useless data constantly. You need a form of cache for even faster read/write times.
Gigabytes of L3 cache when
Gigabytes plural? Maybe a while. Gigabyte singular? Already a thing. AMD EPYC 9684X(https://www.amd.com/en/products/processors/server/epyc/4th-generation-9004-and-8004-series/amd-epyc-9684x.html)