Everything is at stock. CPU-Z is showing
1,213 V right now.
I can never be 100% sure, that it's making full contact, but I mounted it 2 times already, and the stock cooler also 2 times. Tried 2 different thermal pastes too. It doesn't make any contact with the memory. The airflow should also be satisfying, because it's outside the case right now (I got the same results in the case too).
What's really interesting, is the ~40 °C difference in the temperatures of different cores as shown below.
View attachment 167980