Quote Originally Posted by theoldtimer View Post
Yeah, although the 4100 will keep running run just a little colder than the 8150 did. If I do a normal warm restart it will post at -135/140C or so but in Windows if during a test run if I get the temp below -165C +/- the system locks then after a reset it won’t post until the fluke reads -95C or warmer.

It proceeds something like this during the next post attempt. Temp below -165C +/- the fans run but no video or hard drive activity, next at a temp -130/140C +/- during a post attempt the GPU fan runs at high RPM but no post no video or hard drive activity, lastly at a temp of -95C or warmer it posts normally.

It’s hard to believe that both chips would CB-CBB so I’m wondering if the MB or something else has an issue. I may try it in the AsRock MB to see it the problem persists. That is if I have enough LN2 left to get it cold but if not I don’t plan to buy any more just to find out if it’s the MB.

Oh well it has been interesting none the less.
I'm almost sure it's the board. Too sad my Crosshair IV has the same issue. On contrary M4A89GTD Pro/USB3 worked flawlessly at -190 for hours. With the same CPU.