This article gives this comparison chart for the four Windows 8 Editions (Core is usually just called Windows 8). I notice specifically, about half-way down, the max physical processors is listed as 1 for "Core" and 2 for all other.
In the second image i see physical processors listed as 8 in a Windows 8 Task Manager.
My question is, what is the limit then? Can anyone verify the article or the screenshot?
Was this a mock-up? Another Edition? (Server perhaps?)
To clarify, i am looking for links to official microsoft.com articles detailing these specifications.
I have been unable to find any.
Answer
Since you're talking about the max. physical (not logical) processors supported, I can say that the numbers for Windows 8 Core (1) and Pro (2) are most likely correct. I'm sure this sort of limitation is for the client versions of Microsoft's OS only, and not the server versions.
As for official documents, other than the About.com page that mwong mentioned (with no sources listed, which Thurrott also omits), I have so far not found any technical documents regarding the limitation (all I could find were older ones related to Windows 7). What I did find however were legal documents that specify the number of physical processors the two versions are licensed to run on, so most likely the code enforces the legal limit as well.
What are these legal documents? They are the EULAs we all ignore while installing Windows. If you don't want to bother running Setup to confirm, you can download PDF copies here.
Windows 8 (Core) Software License Agreement
Windows 8 Pro Software License Agreement
The EULA for Windows RT does not seem to explicitly mention the number of physical processors supported. Windows Server (2012) versions are licensed depending on the number of processors installed (each license = 2 physical processors, so no. of licenses required = ceil(no. of physical processors installed / 2)).
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