Sebastian_Hagen comments on Superintelligence 5: Forms of Superintelligence - Less Wrong
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Bostrom says that machines can clearly have much better working memory than ours, which can remember a puny 4-5 chunks of information (p60). I'm not sure why this is so clear, except that it seems likely that everything can be much better for machine intelligences given the hardware advantages already mentioned, and given the much broader range of possible machine intelligences than biological ones.
To the extent that working memory is just like having a sheet of paper to one side where you can write things, we more or less already have that, though I agree it could be better integrated. To the extent that working memory involves something more complicated, like the remembered ideas being actively juggled in some fashion in our minds, I see no clear (extra) reason that machines would do a lot better. I personally don't have a good enough understanding of why our working memories are so small to begin with - clearly we have a lot more storage capacity in some sense, which is used for other memories.
And faster, by many orders of magnitude! Modern PCs already have ram capacities on the order of tens of gigabytes. If we're talking about simply written words (as opposed to arbitrary drawings, the storage space requirements for which are somewhat trickier), that's not the equivalent of a page, or a book - it's on the order of a library. And they can read or overwrite the whole thing within a few seconds.
Yes, in principle you can do the same thing by hand. In practice, writing out even one full ram dump by hand would probably take longer than a current human lifetime.
That by itself would provide a speed-type superintelligence advantage, to the extent that flat (i.e. not associative to the same extent human memory is) memory is a limitation on our intelligence.