I'am searching on the net how many physical cpu's max. windows 8 can use?

I only find old news ,where it is still not clear if it's 4 or 8 cpu's.
Maybe someone else know the real number off cpu's Windows 8 will recognize!

In Windows 7 it was 2 cpu's (not in all versions) for 4 cpu's we have to use Windows server OS.

Or is it the same thing for Windows 8 that you have to use Server OS version?

JP.