Confirming: BIOS allows frequency to be set, but 4400MHz is the highest. I left mine at Auto. No stability issues so far.The spec sheet only advertises 4400Mhz, so I highly doubt it, but next time I can get into the BIOS I'll check (running an 8 hour long test now).
As hoped, this CPU is about 20% faster than the Ryzen 5900 for our CFD application, even though the Ryzen was tested on an enthusiast platform (using Ryzen Master to tweak CPU and RAM), vs. this conservative Supermicro platform (with bonus IPMI).
Side note: It's WAY faster than the older i9-7960x HEDT it replaces, solving the same benchmark in 2.79 hours on all 8 cores vs 4.60 on the 16 core 7960x. My engineers are going to like this. Now I need to build 2 more - though part of me really wants to test the Ryzen 5800x3d to see if that extra L3 helps - when I tested 2x Zen 2 chips, the 3900x and a 7302P, the extra cache on the EPYC did not seem to help that much. I'd rather not have another platform to support and last I checked ASrock was about the only show in town for Ryzen server boards so I think I'll leave than as an unknown.