So finally I managed to get a better coller (EKL Alpenföhn Himalaya 2) but now only one RAM stick fits
since it's a high RAM.
Nevertheless I'm running now the stress test with only 1 stick and the system sims to be stable for 4.6GHz @ 1.257V (bios setting) and 4.5GHz cache.
But the VRM of the board gets hot.... 70 -75°C w/o fan and incredibly stable 47°C with Noctua NF-A8 full speed blowing directly on VRM from the top.
Does any one know how many °C the second RAM stick will add?
SO the CPU is not damaged
The next step will be delidding