Are you referring to the old AGP video card or video cards for VGA connections well there are lots of them - If your motherboard inside your computer have a PCIe for the video card then you can purchase a video card with a minimal of 512Mb (this is the video ram) but most video card now a days has almost a 1Gb of video ram though you don't need this. 128bit is enough you don't need a 256bit card.