It's interesting we're getting near the computer hardware equivalence to a human brain point - Kurzweil suggesting 2019 for a $4000 computer. I think he may be a bit optimistic there. He has brain equivalence at about 10^16 flops. Hans Moravec who also did some calculations figured about 10^14. I see present tech is around 7*10^12 for the $999 Nvidia Titan X GPU. So 15 of those just now for the Moravec number I guess.