I am running in a Mac Pro 3,1 right now and it mostly does what I need, but I am beginning to play some games (Black Ops and Batman Arkham City) and its beginning to show its age. Now I could drop $400 or so on a 670 and drop it in and that would probably take care of my graphics slow downs, but I am also thinking ahead to the future. I currently have 16GB of RAM and sometimes it gets maxed out, I'd like to go up to 32GB but its prohibitively expensive for this model. I have been pricing out used 4,1's and 5,1's and could get a entry level 5,1 with 16GB on a trade in for my 3,1 for around $800 but then I'm still getting 'old' technology. Perhaps a better way to go would be to spend around $1300 and build a very fast hack. I know there are many opinions around the morals of building hacks, not really looking for those opinions. I also know I don't have to spend $1300 and could drop it down a few notches, this is with a 3770k and I know I'd be happy with a 2500k. I just figure if I am going to pour anymore money into this aging 3,1 I think I might rather put it towards a whole new system with USB 3, thunderbolt, SATA2 and SATA3 speeds. Just thinking out loud. Comments welcome.