Voodoo2

Graphics, Half-Life would run in software on almost anything, but it looked blocky and grainy.

Uh, plug in a 3D card like a Voodoo 2 and run it in OpenGL, and you got smooth textures, colored lighting, and a steady frame rate.

There was a Direct3D option too, but most people with a Voodoo stuck with OpenGL.

So it's the same story as the sound, Lee.