The computational capacity of a $4,000 computing device (in 1999 dollars) is approximately equal to the computational capability of the human brain (20 million billion calculations per second).
Statement text from the data file published with the LessWrong 2020 assessment (https://www.dropbox.com/s/jmvciqv7u3rs7x5/Kurzweil_2019.tsv?dl=0), which splits the chapter into 105 statements.