Upgrade from 10.4.11 to 10.9 on a Mac Pro

I have an old Mac Pro with the following serial number G87391T6UPZ. Can I upgrade this computer to 10.9 or 10.10?

I can't seem to find an official website that tells me 'yes' or 'no'. It runs on a 2.66 Ghz Quad-Core Intel Xeon. There was a website that mentioned early 2008 and up can upgrade. But not sure when this was made...

Edit:

It says it is MacPro 1,1

Solution 1:

There is only one available 2.66 GHZ Quad-Core Intel Xeon Mac Pro, which actually is powered by two 2.66 GHz dual core Intel Xeon 5150 processors: MacPro1,1

The maximum OS is Mac OS X 10.7.5, if the RAM was upgraded to at least 2 GB.

Solution 2:

It is possible to upgraded a MacPro1,1 to Yosemite, but it is a bit of work and not perfect. You will have to add a third-party new boot loader software, and most likely upgrade the graphics card. A number of OS X -- mostly minor -- features will not be available.

This is almost like building a Hackintosh, but Apple will not consider you as violating OS X's license.

For full details see: http://forums.macrumors.com/showthread.php?t=1740775

Remember, the setup could break when ever you do a minor system update. So you would want to carefully research an upgrade from 10.10.1 to 10.10.2