Re: 4 CPU's - That's a lot!
That might be an artificial limit to the 'as supplied' Kernel.
Don't forget that you have full access to the Kernel sources (and is a simple yum install away) and there is nothing to stop you building a custom kernel. :) :) :)
I'm waiting (not!) for MS to implement a per core subscription fee for Windows 10. HT would naturally be counted as a full core by the beancounters. I'm sure it is there somewhere in their plans.