Hi, I'm pretty much a newb when it comes to computer stuff, but i just bought this computer Computer and I want to upgrade the graphics card but I'm not sure which cards are compatible with my computer. I tried doing a little research to find out information about graphics card, but I didn't find much useful information. I would like to know more than just a list of graphic cards that will work. I'm wondering what feature of the computer determines what graphics cards are compatible. Also the monitor that I have is this one Monitor Thanks in advance for any input.