So just a few questions before I go out and spend the money. I looked online but it seems like I got a few mixed answers. I currently have the newest Quad Core 2.8Ghz Mac Pro, Will I be able to upgrade it to dual CPU? If so what are my options, and if not what are my single CPU options? 1. Can I just buy an identical CPU and throw it in there? Will i need a heatsink replacement? 2. If I have to get different CPUs which ones do you recommend? 3. If there is only 1 slot for a CPU in my machine which 6 Core CPU could I get? Also.. as a side question, I remember when I had a Powermac G5 I bought a windows video card and flashed it to work, are there any options for such a thing with the newer/newest line of cards and if so does anyone have a link? Thanks!