Phillipp it must be my own memory failing, not my computer! My resource tab is exactly as above. But I did try an experiment. I moved my CPU Threads to 1, and put the system under load with Pix4D. All of my cores were utilized, but the percentage of each was lowered.
There is another Community thread that might be of interest to you:
hhttps://community.pix4d.com/t/5306-New-Xeon-Computer#gsc.tab=0