Is the Intel Core i5-4690K 3.5GHz compatible with Asus M5A78L-M/USB3?

N1KKII

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Jan 10, 2015
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No, its not compatible.

That mobo supports AMD Socket AM3+ FX / PhenomII / AthlonII / Sempron™ 100- series only.

You need to find a mobo which supports LGA1150 socket :)