I am a semi-retired gamer, and I find these discussions interesting to say the least.
For the OP I think the questions are: -
1. What is the maximum spec Mac Pro you need/can afford to do the main job you need?
2. Will this be good enough for you to game on?
3. If the answer to 2 is no, then how much more is it to get the Mac Pro that will give you performance for gaming?
4. Is the answer to 3 worth spending compared to buying a separate gaming PC?
In my case, my gaming is so limited now, I cannot justify the space or cost for a dedicated gaming PC, so I make do with my MacBook Pro 15" and accept the compromise.
For the OP I think the questions are: -
1. What is the maximum spec Mac Pro you need/can afford to do the main job you need?
2. Will this be good enough for you to game on?
3. If the answer to 2 is no, then how much more is it to get the Mac Pro that will give you performance for gaming?
4. Is the answer to 3 worth spending compared to buying a separate gaming PC?
In my case, my gaming is so limited now, I cannot justify the space or cost for a dedicated gaming PC, so I make do with my MacBook Pro 15" and accept the compromise.