Tom's Hardware has posted a comparison between the 1,1GHz Duron and the 1,2GHz Celeron
Currently no CPU offers more performance for less than $150. AMD and Intel unveil their fastest low-cost processors for the bottom end of the market. AMD expands its Duron series with a 1100-MHz variation - Intel keeps up with the competition by offering the Celeron 1200 in the same class. One thing is certain at any rate; the top models at the beginner level were never to be had so inexpensively! However, both CPUs are equipped with state-of-the-art technology and, seen in terms of value for money, are absolute front-runners - you just can't get more power for your money. Among these, the AMD Duron 1100 wins honorable mention: it only costs $102 and fits into all Socket 462 boards (Socket A).Read more
