HT201364 why is my computer not compatible with OS X Mountain Lion

I Have a MAC Pro late 2007 with 13GB Memory & 2TB I purchased OS X Mountain Lion as an upgrade to Lion, now I'm told the this is not compatible, why?

Hardware is the reason you can't upgrade. Older CPUs and other parts and pieces can't handle the load.
Upgrade to Mountain Lion/Mavericks.
Check that your computer is compatible with Mountain Lion/Mavericks.
To check the model number hold down the option/alt key, go to the Apple menu and select System Information.
Mac Pro (Early 2008 or newer) model number 3,1 or higher
Your Mac needs:
OS X v10.6.8 or OS X Lion already installed
2 GB or more of memory (More is better - 4 GB minimum seems to be the consensus)
8 GB or more of available space
If your computer isn’t compatible, you might be able to upgrade to Lion. Based on my experience, I recommend staying with Snow Leopard. You could partition your hard drive and 'test drive' Lion.      
Computer Compatibility - Lion                       Lion
Check to make sure your applications are compatible. PowerPC applications are no longer supported beyond 10.7.      
Application Compatibility

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    Does your computer fit within the categories below?
    Supported
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    Xserve (Early 2009)
    MacBook Air (Late 2008 or newer)
    Mac mini (Early 2009 or newer)
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                             [click on images to enlarge]
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