I recently bought a Mac Pro 3,1 (3.0Ghz 8-core Xeon/24gig RAM) and have been tinkering happily with it ever since. I've installed a USB 3.0 card and a 512gb SSD boot drive: now I'd like to do something with the Geforce 8800XT graphics card. I'd greatly prefer leaving my SSD in the second x16 slot where it is, so I'd like to get a low-profile card single slot card if at all possible. Some of the AMD Firepros meet that bill -- and have reasonable power requirements as well so I won't need to fool with extra power supplies or suchlike. I don't do a lot of gaming and don't really care about being able to play Crysis 3 4k at 150fps etc., but I do have a copy of Blender and a few manuals on my machine and may experiment a bit with 3d modeling just to see how it's done. And I'd like a card which would be able to handle 4k video for viewing rather than editing, which won't become obsolete within the next year or two, and which is built to last -- all of which should be met by a 4xx or 5xx Firepro. If these are out of the question, what would my other options be for a single slot low profile graphics upgrade?