I got an early 2008 mac pro a few days ago and am really enjoying it so far. Everything is standard (2 2.8gz quad core xeon, 2gb ram, 320gb Hd + 500gb HD, 2600xt ) with the addition of another hard drive. I want to install a radeon HD4650 1gb for use in windows only, so I don't want to flash it or use the injector. Firstly, can anyone tell me how much of an improvement the HD4650 1gb would be over the 2600xt 256mb currently installed ? More importantly though, lets say I install the HD4650 in the 2nd PCIe slot. Would I need to swap the DVI connector coming from the apple display to the HD4650 everytime I boot into windows to make full use of it and see the benefits ? If I left the DVI connector hooked up to the 2600xt when I boot into windows would having the HD4650 in the PCIe slot beside it have any effect on performance ? I know this is a very simple question that I should know the answer to, but I've always used single graphics cards in the past on windows machines. Thanks in advance.