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Dual core will boost applications that aren't multicore aware, when running the application it can take a whole core to it's self and operating system and anyother program running will use the other core. In a single core system everything is shared so no program can take a full core's worth of performance.
The SU4100 is a 64-bit capable chip as well according to the ARK.
I think it's confusing as the SU4100 is the top end chip in the "Pentium" line and the SU3500 is one up from the bottom in the "Core2" line.
The SU3500 is half the power consumption of the SU4100 so the battery life could be longer and the laptop could be much thinner.
Personally I'd take 2 cores over one any day.