Where would i download that at?
hell if i know, i dont know what brand your card is or what distribution of linux you're running.
when you know those, use your favorite search engine to search "*card brand* *linux distro* non-free drivers" where *card brand* is your graphics card manufacturer, and *linux distro* is, predictably enough, the distribution of linux you have installed.
you might prefix the search with "HOWTO" or attach "tutorial" to the end, if you want step by step directions.