RAM: Your computer uses RAM, (random access memory), to perform functions and operations. More RAM allows your computer to perform tasks simultaneously and run faster. You can boost performance by installing additional RAM or replacing the existing computer hardware with larger memory sticks

Hard drive: Hard drives on most laptop and desktop computers are modular and can be easily swapped for a faster model with a larger memory capacity. With a larger hard drive, you can store more programs, music and photos. You can even install more than one hard drive in a desktop computer to expand storage or back up files. (e.g. "out of memory") error message when trying to print documents.

Optical disc drive: Upgrading to a new DVD burner or a Blu-ray disc drive will give your computer new capabilities. An optical drive is easy to install, and you may even be able to install multiple drives on the same desktop, with one drive as the master drive and a second as a “slave” drive.

Video card: Graphics processing units, or video cards, are for computers that handle heavy image processing in video games and 3-D rendering software. A new video card can boost the graphics, processing ability, allowing you to play the latest games or use your computer as a high-definition entertainment center with your HDTV.