Just to make some things clear.
Deeper Pipeline != Higher Frequency
Shorter Pipeline != Higher IPC
I have a feeling that people have read some P4 articles and made some conclusions of their own. To achieve high frequency a deep pipe can help, but there are reasons to put more stages in a processor other than frequency. And the other way around, more stages don't automatically lower IPC. Depending on the nature of the stages, more stages can actually improve IPC.




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