Yes, it arrived few days after post ...
I'm using Zalman STC9 paste after years of MX4 since I noticed that MX4 disappeared after cca 1 year of use on two chips..
Max temp under 70C with almost summer conditions, Arctic 120mm tower, 4 pipes, 160W max CPU reported, but case is well ventilated.
4.2 GHz, stock volts, 50% drop (cca 1.23V all-core load).
It needs 1.3V for 4.4 stable, but 200MHz is not worth it for almost 0.1V increase ...
Apparently loves 1.7V PLL, needs 1.1V on NB to be 100% stable at 1866 MHz RAM.
No OC/Volt difference using 1.25 strap ...