US$20-30 is the going rate for a quad A15 like Exynos Octa or Tegra 4 so a 2.4 GHz Bay Trail will be superior at the same price. Mediatek's MT8135 offering is a 1.5 GHz dual-core A15 1.2 GHz dual-core A7 big.little quad which is not in the same performance ballpark as any Bay Trail.
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