6 (5 pts) Which improvement gives a greater reduction in execution time: one that is used 30 percent of the time but improves performance by a factor of 2 when used, one that is used 80 percent of the time but only improves performance by a factor of 1.3 when used? 7 (10 pts) A computer architect is designing the memory system for the next version of a processor. If the current version of the processor spends 50 percent of its time processing memory references, by how much must the architect speed up the memory system to achieve (a) an overall speedup of 1.4? (b) How about a speed up of 1.8? 6 (5 pts) Which improvement gives a greater reduction in execution time: one that is used 30 percent of the time but improves performance by a factor of 2 when used, one that is used 80 percent of the time but only improves performance by a factor of 1.3 when used? 7 (10 pts) A computer architect is designing the memory system for the next version of a processor. If the current version of the processor spends 50 percent of its time processing memory references, by how much must the architect speed up the memory system to achieve (a) an overall speedup of 1.4? (b) How about a speed up of 1.8