In agreement with Vaniver's comment, there is evidence that differences in IQ well above 120 are predictive of success, especially in science. For example:
IQs of a sample of eminent scientists were much higher than the average for science PhDs (~160 vs ~130)
Among those who take the SAT at age 13, scorers in the top .1% end up outperforming the top 1% in terms of patents and scientific publications produced as adults
I don't think I have good information on whether these returns are diminishing, but we can at least say that they are not vanishing. There doesn't seem to be any point beyond which the correlation disappears.
I just read the "IQ's of eminent scientists" and realized I really need to get my IQ tested.
I've been relying on my younger brother's test (with the knowledge that older brothers tend to do slightly better but usually within an sd) to guesstimate my own IQ but a) it was probably a capped score like Feynman's since he took it in middle school and b) I have to know if there's a 95% chance of failure going into my field. I'd like to think I'm smart enough to be prominent, but it's irrational not to check first.
Thanks for the information; you might have just saved me a lot of trouble down the line, one way or the other.
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