I have a Dell Dimension, which I bought about 3 years ago. I am planning to build a new PC soon, but have been upgrading individual components. I want to upgrade the video card soon but will likely need a new power supply to do so. I have heard that Dell's require a special power supply. My question is, if I get the Dell power supply, will it fight in another normal ATX case? Or should I wait and pick up a normal size PSU?