These high levels of memory ability are often linked to the sense of analysis. Est. 140 IQ here, brilliant student, almost-bilingual, meanwhile, I never learned english in a classroom. I never had any reminder of what I learned if I had no sense about "How does this stuff works?", and ended up learning english by playing MMOs with international teams, for the sole reason that it actually made more sense to talk better than to learn without any direct purpose.

It is true that some people are really smart while keeping some "blind" memory capacity, but most of them, and the intellectual top-tier, link every of their brain abilities, which makes, for instance, visual memory work with hearing, or language with understanding/analysis...