ATI
ATI
http://www.ati.com
Gainward
Gainward
http://www.gainward.com/
Matrox
Matrox electronic systems ltd.
http://www.matrox.com
NVidia
Nvidia is the world leader in visual computing technologies and the inventor of the gpu, which generates interactive graphics on workstations, desktop computers, game consoles, and more.
http://www.nvidia.com