Small question: I recently aquired a early 2008 Mac pro qc. It came with a HD 2600XT 256mb I installed a windows graphics card to get at least some games to work but I loose the boot screen. I would like to keep the 2600 in the Mac pro, just to use if I have booting problems and need the boot screen, but the aftermarket fan unit on the 2600 is very loud. It was probably very silent some years ago, but now its just terrible. If the 2600 xt is installed in the cMP but not being used (no display connected to it), is it necessary to have the fan running for the card ?