Thanks guys.

This phase unit is one i built a month or so ago (it's in the phase section).
At the moment i'm still in a very refined "tuning stage". If any of you have built a rotary SS you will know what i mean.
Very trial and error, and can take a long time. I think that i'm not far off getting this one spot on. Tuning is a bugger with a rotary,
but the end results, if you get it right, more than make up for all the grief involved. I will point out that i'm about 10 to 11 rounds through 5ghz at the moment.
But i have been there before, just not at this low temps.
By the way, there is no secret to running high clocks with low temps. All you have to do is run CPU PLL at 1.2v. But you do need to be at -38c minimum to be able to run at that.
Anything higher just dosn't run the distance.