" Gates himself has strenuously denied making the comment. In a newspaper column that he wrote in the mid-1990s, Gates responded to a student's question about the quote: "I've said some stupid things and some wrong things, but not that. No one involved in computers would ever say that a certain amount of memory is enough for all time." Later in the column, he added, "I keep bumping into that silly quotation attributed to me that says 640K of memory is enough. There's never a citation; the quotation just floats like a rumor, repeated again and again." "

https://www.computerworld.com/article/2534312/the--640k--quo...