Epyc uses SP3, SP5 or SP6 sockets depending on model.
You can get perfectly normal ATX motherboards for Epyc. There's even a mini-ITX one for some reason:
https://www.asrockrack.com/general/productdetail.asp?Model=R...
You can get perfectly normal ATX motherboards for Epyc. There's even a mini-ITX one for some reason:
https://www.asrockrack.com/general/productdetail.asp?Model=R...
So that you cat fit 2 motherboards in that 2 CPU setup! a.k.a. redundant motherboards. /s
Finally it turned out that it's not a 2U server with 12 bays, but two separate servers in one box, side by side. Half the bays go to one, half to the other. Each side has two CPUs in it, and one was completely powered off.