PROBLEM 4: CPI & CACHE (20 POINTS) Consider two machines: . Machine A with 1GHz clock rate. . Machine B with 2GHz clock rate Both machines implement the same instruction set architecture. The machines have the following speci- fications: Instruction Instruction Machine A cycles for Machine B cycles for instruction class frequency instruction class Arithmetic Load/Store 25% 25 1.5 anc 10% 1.3 Branch A. (5 points) What is the overall CPI for each machine? B. (5 points) Which machine is faster? C. (10 points) Assuming that both machines have LI and L2 cache for both instruction and data memory and the hit rate is 98% and 50% with hit time of 1 and 10 cycles and L2 miss penalty of 100 cycles, what is the change in CPIs and average CPI of each machine