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Here is the kicker though! 10.13 isn't supposed to run on the 2009 Mac Pro, but runs perfectly fine! If you flash the 2009 Mac Pro with the 2010 Mac Pro firmware, it runs it fine. (Yes, the 2010 firmware allows you to flash the 2009 model)
No reasons they can't give support for the 2009 model as well, it runs it fine! They have a GT120 card that I don't think supports Metal. But the OS runs great, no lag, etc. I did upgrade to an SSD though to help with speed.