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"Tag Ram" chips used to be pretty common in CPU caches. My old 486 had a tag ram chip, and it ran at a higher speed than the SRAM chips in the L2 cache. I think it was 10 or 15ns, so it was kinda slow by today's standards. There were even different options for it. Then the PII and PPro came along with built-in caches (or at least on the CPU module, as in the case of the PII), and these things basically just disappeared.
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