First pull down for the day on a QX6850. Takes a long time to get down, but once its where i want it i can work the temps very well even at high volts and clocks :)
As per title. I found controlling the temps very easy once the pot had "transitioned" (thanks Kinc) by bringing it down way low, it was like a totally different pot and had no problem with the load.
Unexplained transition of copper themal properties under extreme cooling. LN2 benching needs to pass thru at leats one or two fo these transitions before th pot will perform well under load.