7.19 A certain two-way set-associative cache has an access time of 4 ns, compared to a miss time of 60 ns. Without the cache, main memory access time was 50 ns. Running a set of bench marks with and without the cache indicated a speedup of 90%. What is the approximate hit ratio? (7.5) (87.5) .20 A 128 MB main memory has a 64 KB direct-mapped cache with 16 bytes per line. a.
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