The access time of a word in 4 MB main memory is 100 ms. The access time of a wo

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Question
The access time of a word in 4 MB main memory is 100 ms. The access time of a word in a 32 kb data cache memory is 10 ns. The average data cache bit ratio is 0.95. The efficiency of memory access time is
Options
A. 9.5 ns
B. 14.5 ns
C. 20 ns
D. 95 ns

Correct Answer

14.5 ns

Explanation

Access time = 0.95 x 10 + 0.05 x 100.

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