Thanks for the review.

Interesting design... does the heatsink actually become really hot with trapped hot air, as in starved for air?
Have you tried adding another fan nearby in various configs to see if that helps or detriments in cooling performance under load?
Do you have a pic or two of it mounted on your board?

BTW those DTS are obviously very faulty, reading ambient is -20C minimum real at 1.5V. Actual temps of core or IHS at 1.5V on any modern CPU will be flying sky high on best ac, plus 80C. But nevertheless maintaining a delta of -10C from the BT is quite good. What's the delta between the two at say 1.4V at similar MHz?

I know I'd never run 1.5V on air 24/7, not even 1.45V because of the load temps nearing the limit. 1.4V seems fine though.