I have noticed with HT enabled on my 975 I am able to bench more consistently w/o issues at 5.2~5.3GHz range with temps around -65~-75 degrees celsius..it will run all the way up to -115~-120 but ONLY if sub timings are loose and mem mhz is not super high. The only success I have had when running tight subs/high mhz on my memory is warmer temps which makes sense in regards to the IMC being the culprit with CB temps as you have mentioned.
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