Consider a five stage pipeline having stages IF,ID,OF,EX and WB having stage delays 5,6,14,20 and 8 ns. Buffer delay is 2 ns.(say this is pipeline design 1).
Now in this design, if we break the EX stage into 2 stages having delays 12ns and 8 ns(say this is design 2).
What is the speedup we can get by using design 2 over design 1 for executing 20 instructions ?