4. Suppose we have two implementations of the same instruction set architecture. Computer A has a clock cycle time of 210ps and a CPI of 2.2 for some program, and computer B has a clock cycle time of 460ps and a CPI of 1.3 for the same program. Which computer is faster for this program and by how much? 5. Consider three different processors P1, P2, and P3 executing the same instruction set. P1 has a 3.1GHz clock rate and a CPI (cycles per instruction) of 1.6. P2 has a 2.4GHz clock rate and a CPI of 1.2. P3 has a 4.0GHz clock rate and has a CPI of 2.0. a. Which processor has the highest performance expressed in instructions per second? b. If the processors each execute a program in 10 seconds, find the number of cycles and the number of instructions. c. We are trying to reduce the execution time by 30% but this leads to an increase of 20% in the CPI. What clock rate should we have to get this time reduction