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Let me rephrase: What is the main difference (feature wise) between the Exynos 4210 and A5? What technical backing does their marketing have (9x better this and 100% faster that).

Samsung is pretty explicit about what their SoC contains: http://www.samsung.com/global/business/semiconductor/product... - well they have to, opposed to Apple they're selling the chip seperately.

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The Exynos uses an ARM Mali 400 GPU; the A5 uses an Imagination Tech SGX543MP2. The latter is far faster; at least twice as fast in most benchmarks. Also, the A5 is known to have a lot of extra DSP hardware on chip, but the purpose of that is somewhat unclear for now (it has been claimed that it's to do with facial recognition, fast camera operation and/or Siri, but really no-one knows for now).

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