While the discussion about the features, number of cores and the clock frequency we discussed in the previous post give us some idea, at the end of the day, we need numbers that will compare them in performance.
Here are the benchmark results that compare A6-4400M with A6-3420M
PassMark CPU Mark Score Benchmark
3D Mark 06 CPU Benchmark
Windows 7 Experience Score Benchmark
You can check the clock, number of cores and other detailed comparison in the previous post.