Video Card (GPU) Installation
Video card or graphic card will make a tremendous improvement in overall system performance. With a dedicated video card, your CPU will not work as hard, and you will have more RAM available to run programs, which will mean that your hard drive(s) are accessed less. This translates to programs open/close faster, and the display on your monitor gets refreshed faster. That is, after the program opens (or closes, or whatever), you will see the results faster. These improvements make the computer feel like a faster computer, even if it's not significantly faster.