Sadly 128GB is easy without ECC, but hard with ECC. There are 16GB ubuffered ECC dimms around for $100 or so, but no 32GB ECC I could find.
So 64GB ECC is easy, 128GB ECC not ... unless you upgrade to one of the "P" Epycs like the 7302P or 7402P. That gets you 16 cores/32 threads (ryzen 3900 x = 12 cores/24 threads) but also 4 times the memory bandwidth.
So 64GB ECC is easy, 128GB ECC not ... unless you upgrade to one of the "P" Epycs like the 7302P or 7402P. That gets you 16 cores/32 threads (ryzen 3900 x = 12 cores/24 threads) but also 4 times the memory bandwidth.