$A c a c h e l i n e i s 64 b y t e s . T h e m a i n m e m o r y$
$h a s l a t e n c y 32 n s a n d b a n d w i d t h 1 G B / s .$
$T h e t i m e r e q u i r e d t o f e t c h t h e e n t i r e c a c h e$
$l i n e f r o m t h e m a i n m e m o r y i s$

96 n s

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128 n s

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64 n s

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32 n s

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Solution

The correct option is A $96 n s$
$A c a c h e l i n e s i z e = 64 B y t e s$

$S o c a c h e a c c e s s t i m e = \frac{64 B}{2 G B p s} = 64 n s e c$

$T o t a l t i m e t o f e t c h t h e e n t i r e c a c h e$
$= M a i n m / m l a t e n c y + T r a n s f e r t i m e$

$= 32 n s e c + 64 n s e c = 96 n s e c$

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