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GATE | GATE-CS-2014-(Set-3) | Question 65

Consider the following processors (ns stands for nanoseconds). Assume that the pipeline registers have zero latency.
P1: Four-stage pipeline with stage 
    latencies 1 ns, 2 ns, 2 ns, 1 ns.
P2: Four-stage pipeline with stage 
    latencies 1 ns, 1.5 ns, 1.5 ns, 1.5 ns.
P3: Five-stage pipeline with stage 
    latencies 0.5 ns, 1 ns, 1 ns, 0.6 ns, 1 ns.
P4: Five-stage pipeline with stage 
    latencies 0.5 ns, 0.5 ns, 1 ns, 1 ns, 1.1 ns. 
Which processor has the highest peak clock frequency?

(A)

P1

(B)

P2

(C)

P3

(D)

P4

Answer

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