Re: 4 CPU's - That's a lot!
Windows kernel can handle a lot more too. And I'm sure you realize it is 4 socket not 4 cpu.
Though hard for me to imagine if you needed ao many sockets and TBs of memory just get the server version of the OS. The cost of the software will be a rounding error on such a system anyway.
Just checked redhat workstation and it seems to top out at 2 sockets. That would be perhaps the closest comparable product in the linux world.
(Linux user on server+desktop+laptop mostly debian since 1996)