|You are close to the correct terminology. You must mean Graphics Chip. |
Chip set generally refers to a chip on the motherboard that controls more than just graphics, although it can incorporate graphics too.
You didn't list the model of your Gateway computer so we can only generalize. If you have a laptop you can't do anything. You are stuck with integrated graphics. If you have a desktop you should be able to install some type of add in graphics card. Post the model series and full model number.