I have a dell B110. I just bought a new video card which is geforce 8400gs pci card. The card needs 300watts. The Dell has 250. I can’t find any facts if it’s Proprietary power supply. Some say it is, some say it aint. I may call dell but they may just say it is to make a quick buck. I just purchased ultra LS 350 power supply but I’m not sure if I should open it. I’m scared I may blow up my computer. So does anyone know what I should do?