I have a 2013 3.20GHZ Mac pro. 8 GB of ram. My GPU is a Radeon 5870. I know it's old, I'm planning on upgrading it. I'm just waiting to see if the next gen cards from Radeon come out for mac.
Mostly, I use it for gaming on a dedicated SSD for Bootcamp. I do all my productivity work, minor editing, photoshop, etc. on the Mac non-ssd drive.
I'd rather not think about upgrading to the new Mac pro 2014 anytime soon.. I want this 2013 model to last me a few years first 🙂.