SiSoft Sandra
Let's start by taking a look at the memory performance of the various processor configurations. Sandra is a synthetic benchmark, but it will give us a good idea of how the number of processors and their speed affect memory bandwidth.

On the low end, memory bandwidth benefits substantially from the addition of a second processor. The dual Duron setup splits the difference with the single Athlon MP 1900+, barely winning the integer test and barely losing the floating point test.

On the high end, the Athlon MP 1.2GHz technically wins, but the fact is that all of the top three finishers have hit a bandwidth wall. Where's DDR333 when you need it?

Content Creation Winstone
Moving on to some more practical application benchmarks, we have Content Creation Winstone. This benchmark measures a system's ability to run several content creation applications, including Dreamweaver, Premiere and Photoshop.

There are several interesting things going on here. The Duron configurations are well behind the Athlons, in spite of the fact that the Morgan core shares the Athlon MP's core enhancements. It seems the Athlon MP's higher bus speed and/or larger cache provides a lot of benefit to CC Winstone. Also interesting is that the CC Winstone doesn't benefit much from the addition of a second processor when running on the Duron.

The gap between the 1800+ and the 1900+ is substantial, especially given a relatively small 66MHz difference in clock speed. Finally, note that with the Athlon MP 1900+, CC Winstone does garner some benefit from the additional processor, as the dual configuration bests the single by 1.7 points.