<i>The human brain is limited by its slow speed, by the amount of cortical mass you can fit inside a human skull, and by the length of human lifetimes. Computers will not have any of those limitations.</i><p>Right, but the idea I&#x27;m playing around with is this:  Suppose you had a hypothetical creature with a brain 20x as fast as the human brain and with twice the volume.  How much <i>smarter</i> would that creature be <i>in practice</i>.  It&#x27;s kind of an abstract idea (and I probably don&#x27;t fully understand it myself), but I&#x27;m getting at something like &quot;is there a point where that additional raw computing power just doesn&#x27;t buy you anything meaningful&quot; at least in terms of &quot;does it represent an existential threat?&quot; or &quot;does the nuclear analogy hold?&quot;