You wouldn’t believe the compute you can get if you just make one side of the entire motherboard the CPU socket, and toss all that other shit on the underside. Of course you have to use the entire side of the case as the heatsink, and actively cool the fins or the tips will start to glow, but you’ll have so much compute.
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.
