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With Krait 300/400, Qualcomm is really evolving its Krait architecture the right way.
Brian already went through and did a great job explaining what the 7260 is and what it's capable of in his article from last year.
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This is a significant step forward compared with the AMD A10-6800K, which integrated just 384 cores (though it did clock them faster, at 844MHz, compared with the A10-7850K's 720MHz).
Compare AMD A10 7850K vs AMD A10 7870K