Hexus.net have a review of the 1Ghz Morgan based core Duron. This core is based on the new Palomino structure of the Athlon4. It is a lot faster than the older Spitfire core. It could be taken as a TBird beater under certain conditions. Snip:
A processor works in a special way; it uses transistors which basically switch many 1s and 0s. The Spitfire core has 25 million transistors all of these were different size, the new Morgan core has 25.18Million transistors. This new Duron core has a stack of new optimizations. These can all help with the power saving and performance. The die size of the Duron based on the Morgan core is 106mm^2 compared to 100mm^2 which the Spitfire core has.