In 1997, an IBM supercomputer called Deep Blue beat Chess Grandmaster Garry Kasparov. This was a somewhat controversial match simply because Kasparov could make claims and Deep Blue was incapable of speech.
IBM disassembled Deep Blue shortly thereafter so no follow up is possible. The six games played have been left on a web site for anyone to review if they wish.
If we look at the top500 list for June 1997, we find that the fastest computer that year was: Sandia National Laboratories computer called ASCI Red which used 7264 Intel processors. Its Rmax was 1068 GigaFlops, and its Rpeak was 1453.
Deep Blue ranked 259 in June of 1997 and its rank fell to 388 by November of that year. Those are the only two rankings ever given to Deep Blue, which was specifically programmed to play chess. Deep Blue Rmax was rated at 11.38 GigaFlops and Rpeak was 15.36 GigaFlops. See: http://www.top500.org/site/830 This means that the computer which played chess had about 11% of the computing power of the reigning computer. The chess match was in May and the ranking was in June.
By comparison the fastest computer from June 2005 to November 2006 was: Lawrence Livermore National Laboratories Blue Gene/L, which has been measured at 280 TeraFlops, or 280000 GigaFlops compared to the 1997 Deep Blue's 11.38 GigaFlops.
This means that the fastest supercomputer for 2005 and 2006 has been measured as being more than 24657 times as fast as Deep Blue.