“Exactly 64” will work in an MV Machine at 64 without Overclock.
As for the 42 Recipe, try running it at 64 in an LV Machine, that will work too. 
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“Exactly 64” will work in an MV Machine at 64 without Overclock.
As for the 42 Recipe, try running it at 64 in an LV Machine, that will work too.