CSICS Computer Systems 17. CPU and Computer Performance a) Name THREE of the main components of a CPU and briefly describe their functions, (3 marks) b) What is stored in the Program Counter (PC)? Briefly explain how the PC is used in the fetch-execution instruction cycle. (3 marks) c) How does the technique of pipelining increase performance? (3 marks) d) There is one program running on an 500MHz processor. The executed program contains: 5 million R-class instructions and each R-class instruction needs 3 clock cycles; 4 million I-class instructions and each I-class instruction needs 5 clock cycles; 1 million J-class instructions and cach J-class instruction needs 4 clock cycles. 1) Calculate the average CPI. Explain its meaning. (3 marks) ii) Calculate the MIPS rate. Explain its meaning, (3 marks) III) Calculate the CPU execution time for the given processor. Explain its meaning