Thanks a lot guys

-25C to -35C when the kit was under LN2 cooling.
Don't know the exact temp as put a sensor probe to near the top of a heatsprader.
Probably only need just below 0, but kept that range to prevent condensation.

All Voltages & memory timings were set in UEFI before booted up to OS for 32M.
May be some more room left to tighten up some parameters with MemTweakIT?
Please accept my laziness

As always, look forward to your awesome testing results, Hiwa-san