how to solve it

Question

Q> How much speed do we gain by using the cache,when cache is used 80% of the time? assume cache is faster than main memory.

a)5.27

b)2.00

c)4.16

d)6.09

Comments

I think data is insufficient . Cache is how much faster than MM .

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yup it seems to me also...

Answer 1

S_overall=[(1-F)+F/S]^-1

^{as F=0.8}

^{but S is not given so we can't calculate S_overall}