Does anyone have any concrete experience?
I wad hoping to build a workstation with ECC memory, but it appears only the EYPC cpus have certified support for ECC.
The Xeon W appears to be the most cost effective for guaranteed ECC memory.
64GB DDR4-2666 ECC UDIMM runs perfectly on it, and the kernel reports ECC support.
Day-one memory support was very, pathetically, bad with Threadripper, but it has gotten better. It improved even more with Threadripper 2000.
If Ryzen 3000 is any guide, the gaping memory compatibility gulf between Intel and AMD will probably be closed to a slight gap by the time TR 3000 releases.
As far as I'm aware, every X399 motherboard vendor supports and warranties ECC support on the platform, but only if you use memory on their QVL at its rated speeds.
sTRX4 will likely be no different.
As far as cost-effectiveness, a W-3175X ($2,978.80) and Dominus Extreme ($1,868.74) is indeed $552.45 less expensive than a Supermicro MBD-H11SSL-NC with EPYC 7702P ($5399.99), but the the 7702P is about 37% faster multi-threaded, and about 13% faster single-threaded.