Further the cache is 1MB vs 640kb. And the GPU way faster. This is a system on a chip, not a desktop CPU. So your statement is pretty inaccurate. In various real world benchmarks non-graphics stuff has seen a 1.5-2x improvement and graphics oriented stuff has seen over 7x improvement. I think that justifies the 2x statement enough.
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Further the cache is 1MB vs 640kb. And the GPU way faster. This is a system on a chip, not a desktop CPU. So your statement is pretty inaccurate. In various real world benchmarks non-graphics stuff has seen a 1.5-2x improvement and graphics oriented stuff has seen over 7x improvement. I think that justifies the 2x statement enough.