I recently just purchased one of the early 2008 Mac Pro Desktops, model number MA970LL/A and am trying to upgrade the video card in it. It comes standard with an ATI Radeon HD 2600 xt, and I would like to upgrade to an ATI Radeon HD 4870. I don't know that it will work though, I know that the NVIDEA that comes standard in the early 2009 Mac Pro does not work in the early 2008 Model. Does anyone have any information on this or know if that will work?