About Quad Core and Dual Core PowerMacG5

Hi everyone,
A guy is selling two Power Mac G5.
I'm not so familiar with these G5 line-up, and i'm asking for help.
He send me pictures, he took pictures of both Power Mac's from inside.
In one of them was written only G5 (like this:   
Another one was written G5 two times(like this:   
So can anyone help me which one is the Quad Core 2.5GHz? And is this Two Processor one from Late 2005 or older?
Respect, Leon.

Hi Leon, if he doesn't know...
Find the Serial# & use it on one of these sites, but don't post the Serial# here...
http://www.chipmunk.nl/klantenservice/applemodel.html
http://www.appleserialnumberinfo.com/Desktop/index.php
How to find the serial number of your Apple hardware product...
http://support.apple.com/kb/HT1349

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