What would non-in vitro iterated selection be, just normal breeding of adults?
I'm not sure what you mean by 'normal breeding of adults', but Hsu's proposal would be basically an augmented IVF: you do IVF as usual, sequence each of the embryos to get an estimate of IQ/whatever, and implant the highest-scoring one (usually referred to as just 'PGD'); the embryo develops into an adult, and you repeat the process.
Each generation could get a boost of maybe 5 points (it depends on how many embryos you can produce and how accurate your estimate is and how much of IQ turns out to be genuinely genetic), so in a century that could add up to quite a bit.
The article by Robert Sparrow:
Quote:
The possibility was discussed in MIRI's "Uncertain Future" toy forecasting model back in 2009, and the analysis formulated a few years before that.
ETA: And further discussed in James Miller's recent book, "Singularity Rising."