chew*,

Very nice results and glad to see that part has come to something in its potentially very brief life on your bench. Good to see this kind of scaling (relatively early in the low temperature range - my scale just got terribly warped) on DICE. So on good retail parts the difference between -65C core temp and -185C is about 1GHz. We didn't get our phase system much past 4.5 but we haven't been working much (at all) on phase given the alure of an unlimited supply of LN2 in the back of the building.

These two points will be interesting to watch over the next 12 months.