^Thank you for the screenshots. It appears Asrock has yet to release ABBA BIOS for this Mobo, your CPU isn't boosting to 4.2 Ghz(100mhz lower) due to that.
ASRock's ABBA BIOS fixed boost issues for me. But do note that not all cores can boost to the rated frequency on the box (with single-threaded workload). Most cores do.
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