Mr. Ombudsman REALLY made a difference!
The replacement CPU was shipped at light speed. Actually shipping it from Amsterdam all the way to my home in Austria took less time than for AMD support to answer a simple email question.
A little fun fact.... well, fun for you, another PITA for me.... when I first booted with the new CPU installed the screen stayed black and the ASUS mainboard showed Q-code 02. It took me half a day to find out that the reason was that I had two display ports connected (which was the case all the time with the old CPU). Turns out that I had to boot with only one display port cable connected, enter BIOS, there connect the second display port, save and reboot. After that I was able to boot with both display ports connected.
Thanks again to the people here who supported me!