Turned out a lot of people were running unstable, overclocked hardware sold to them by vendors who had fraudulently misrepresented the hardware.
The original devblog from 2005 is (https://devblogs.microsoft.com/oldnewthing/20050412-47/?p=35...). Aside: Upon pulling that up, I recognized the author as the one who wrote my favorite article about undefined behavior (https://devblogs.microsoft.com/oldnewthing/20140627-00/?p=63...).