

I’d guess that increasing pin count will probably tend to increase energy efficiency, all else held equal.
You need to pull the voltage up and down more quickly to run at a higher frequency clock if you want to move a comparable amount of data over a small number of channels than over many parallel channels.
That means more loss of electrical energy to heat from capacitive reactance.
The more you can do in parallel at a slower frequency, the less you run into problems there.



















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