cpu - RiscV Pipeline why 2 (+4) units?

Question

I was reading on RiscV Pipeline and can't understand why we need two +4 units? In Multi Cycle RiscV we used only one.

I have included this image to help illustrate my idea:

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question from:https://stackoverflow.com/questions/65908718/riscv-pipeline-why-2-4-units

Answer 1

Waitting for answers