dual amd quad core 16G Ram

I'm setting up a server.  I have dual quad core with 16G of ram.  I'm
looking to run 4.4.

the fallowing line in change list:
Make amd64 machines be able to use more than 4G ram, and crank the MAXDSIZ
to allow allocations/mmap() up to 8G

Is this per cpu not core?

Thanks
------------------------
Ben Adams
http://www.sprymed.com/