The radeon 9800 Pro is showing video problems (pixelization, garbled video, dots all over the place, etc.). I want to replace it but I do not know what the power supply wattage is. I want to replace it with a comparable video card. I also would like to keep the heat down (if possible). I am not a gamer but I do casual game playing, graphics intensive work, like photo editing, etc. Does anyone know the wattage of a Dell Dimension 8300? Also, does anyone have any suggestions for a video card replacement?