The video card is what transmits the video signal from your
computer to your monitor. The more memory the video card has, the
less computer memory the system needs to reserve from your system
memory for video, which gives your system more memory to run other
programs. Now, keep in mind that the video card works with
your monitor, so getting a new video card that is more than your
monitor can handle won't help either! Remember, your video
card and monitor work together!