Very helpful, Ta.
"AMD has split its Epyc SKUs into dual and single socket classes – they can be used in either configuration, though, unless they are a P-coded SKU, and a couple appear twice because they straddle both classes. So, for example, AMD recommends using the 7301 in a dual-socket system as an alternative to a pair of $800-plus Intel Xeon E5-2640 v4s, and the 7551P in a single-socket server versus a pair of Xeon E5-2650 v4s."
I cannot find clarity on this. Surprisingly, as its a very common scenario I hear - future proofing with an unused second socket on the chosen mobo.
Part of the reason for 2P popularity is simply adding more cpu grunt later if needed.
The epyc options in this regard are far from clear to me.