Central Processing Unit Q.4

4Consider two processors P1 and P2 executing the same instruction set. Assume that under identical conditions, for the same input, a program running on P2 takes 25% less time but incurs 20% more CPI (clock cycles er instruction) as compared to the program running on P1. If the clock frequency of P1 is 1GHz, then the clock frequency of P2 (in GHz) is ...........

Option : A
Explanation : 1 cycle time for p₁ = 10₁/1GH = 1n.s.
Assume p₁ takes 5 cycles for a program then p₂ takes 20% more, means, 6 cycles.
p₂ Takes 25% less time, means, if p₁ takes 5 n.s, then p₂ takes 3.75 n.s.
Assume p₂ clock frequency is x GHz.
p₂ taken 6 cycles, so 6*10₁/xGH = 3.75, x = 1.6

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