System freezes or orthos fails?
Either way it is not stable on orthos, try going up a notch or two in vcore or temporarily loosening memory main timings or secondary timings. (or drop multiplier to 8x and if runs OK, then rules out memory).
I have same setup and overclock but watercooled, when I increased to 3.9, I recently had to increase my pcie to +0.1V and to 107 to keep stable (was using +.05 and 105 at 3.83). I have my mch and FSB to normal, but you could try upping those first notch or two, all boards can be little different.
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