Re: A thought.
I wondered if perhaps they meant cores rather than actual physical processors (though 4 seemed stupidly low).
But, googling around it looks like it is definitely physical processors than cores that are limited.
Not had much luck finding hex socket workstations from a quick search, so a limit of 4 does seem reasonable (especially given they don't want this used on a server). Looks like server edition supports up to 64 sockets.