A chain is only as strong as its weakest link. A processing system is only as fast as its slowest component, multiplied by the queue-size that results from that differential in speed.
It is very, very often the case that “the slowest component” is precisely the same as it has always been: the disk drives. Not the networks, not the CPUs or the number thereof.
In my opinion, the best way to get definitive answers is: simulation. Except in the very rare case of processing that actually involves CPU-intensive activity, the number of CPUs or cores can almost always be omitted. What matters are things like ... cache hit ratios, data distributions, and I/O avoidance. And this has more or less been true for about sixty years now.
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