Is it possible to upgrade the G5 X1900 video card (top) using the heatsink(s) and fan from the MacPro version (bottom)? I love my X1900 but having the fan blow the hot air against the natural airflow seems counter-productive to me. The MacPro version has a larger fan which will be quieter and move more air and exhausts out the back where the air has to flow anyways. Its either that or an Accelero X2, which isn't that much better since it exhausts onto the logic board. I think can live with the loss of one expansion slot.