Should be no problem on air. Search this forum with with "920 cooling" and/or any other 9xx CPU number.
I've had my 920 at 4.0GHz under my TC14PE, Silver Arrow SB-E and Macho HR-02 no problem. Ran it 3.5GHz under NH-U12P at 70c no problem too... and all was doing multiple sessions of processing graphics so very hard 100% long term loads.
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