Yesterday "Hawk" was officially brought online in Stuttgart using 720.000 Ryzen cores. With a performance of 26 petaflops, it is the first AMD Epyc supercomputer in the top 5.
Unfortunately, I could only find a German source:
https://www.heise.de/newsticker/meldung/Hawk-Weltschnellster-Supercomputer-mit-AMD-Prozessoren-startet-am-HLR-Stuttgart-4663692.html