So i am planning to change my Older Graphic card (Nvidia GeForce 9800 GT) to a newer one. (Nvidia GeForce GTX 580 or Nvidia GeForce GTX 660 ti). i read some forums and browse the net for a search of an answer on how will i install a new g.card to my PC. I have this simple answers like "uninstall your old drivers, shutdown you'r PC, install new g.card then install the latest drivers. Since i'm not really an expert on my computer, i was wondering if there are additional requirement/s for installing these new kind of Graphic Cards. Maybe changing my Power supply or my RAM's? i don't really know :/ Thank you in advance Merry Christmas and a happy new year to all of you