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Suppose when there is cache “Miss” then memory Access is 30ns

and when cache “Hit” then memory access time is 3ns

if 80% is cache hit then effective memory access

  1. 9ns
  2. 8.4ns
  3. 3ns
  4. 9.10ns
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Here the answer is B)8.4

Suppose when there is cache “Miss” then memory Access is 30nsa and when cache “Hit” then memory access time is 3ns if 80% is cache hit then effective memory access

Ans: 8.4ns
0.8*3+0.2*30

A cache memory needs an access time of 3 ns and main memory 30 ns, what is average access time of CPU (assume hit ratio = 80%)?
Ans: 9ns
0.8*3+0.2*33

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