Yeah I read that also about cold bugs. Different chips do different things, my 920 can boot at -130c under LN2 but some others do not have that luck.
I don't remember if that first 3 stager had a hot gas bypass on it. I think those are really needed for these things.
On mine if I start getting CB's with other chips I have to shut down the 2nd stage and wait until pressure has equalized on the 2nd stage before firing it back up. Usually what will happen after I shut it down is temps will slowly start getting warmer and about the time pressure has equalized I am good to go to fire it back up again.
Before I do fire it back up I start the compuer so I am in windows before I reach max temps. It's a pain to do tho. but workable.
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